diff --git a/app/Http/Controllers/SetupController.php b/app/Http/Controllers/SetupController.php
index 23b161d..f5f2ef8 100644
--- a/app/Http/Controllers/SetupController.php
+++ b/app/Http/Controllers/SetupController.php
@@ -3,6 +3,7 @@ namespace App\Http\Controllers;
 use Illuminate\Http\Request;
 use Illuminate\Http\Redirect;
 use Illuminate\Support\Facades\Artisan;
+use Illuminate\Support\Facades\Schema;
 
 use App\Helpers\CryptoHelper;
 use App\Models\User;
@@ -218,8 +219,8 @@ class SetupController extends Controller {
     }
 
     public static function finishSetup(Request $request) {
-        // get data from cookie, decode JSON
         if (!isset($_COOKIE['setup_arguments'])) {
+            // Abort if setup arguments are missing.
             abort(404);
         }
 
@@ -229,12 +230,19 @@ class SetupController extends Controller {
         // unset cookie
         setcookie('setup_arguments', '', time()-3600);
 
-        $transaction_authorised = env('TMP_SETUP_AUTH_KEY') == $setup_finish_args->setup_auth_key;
+        $transaction_authorised = env('TMP_SETUP_AUTH_KEY') === $setup_finish_args->setup_auth_key;
 
         if ($transaction_authorised != true) {
             abort(403, 'Transaction unauthorised.');
         }
 
+        $usersTableExists = Schema::hasTable('users');
+
+        if ($usersTableExists) {
+            // If the users table exists, then the setup process may have already been completed before.
+            abort(403, 'Setup has been completed already.');
+        }
+
         $database_created = self::createDatabase();
         if (!$database_created) {
             return redirect(route('setup'))->with('error', 'Could not create database. Perhaps your credentials were incorrect?');
diff --git a/composer.json b/composer.json
index b0d98ef..0075ef8 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
         "torann/geoip": "^1.0",
         "geoip2/geoip2": "^2.4",
         "nesbot/carbon": "^1.22",
-        "doctrine/dbal": "^2.5",
+        "doctrine/dbal": "2.5.11",
         "google/recaptcha": "~1.1",
         "symfony/http-foundation": "2.7.51"
     },
diff --git a/composer.lock b/composer.lock
index 636374e..4095153 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,20 +4,20 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "09b953d160500e6dfbcaa6c916371495",
+    "content-hash": "aeddc826b32f4e3b68467f58a5a0fd10",
     "packages": [
         {
             "name": "composer/ca-bundle",
-            "version": "1.2.8",
+            "version": "1.2.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/ca-bundle.git",
-                "reference": "8a7ecad675253e4654ea05505233285377405215"
+                "reference": "78a0e288fdcebf92aa2318a8d3656168da6ac1a5"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/ca-bundle/zipball/8a7ecad675253e4654ea05505233285377405215",
-                "reference": "8a7ecad675253e4654ea05505233285377405215",
+                "url": "https://api.github.com/repos/composer/ca-bundle/zipball/78a0e288fdcebf92aa2318a8d3656168da6ac1a5",
+                "reference": "78a0e288fdcebf92aa2318a8d3656168da6ac1a5",
                 "shasum": ""
             },
             "require": {
@@ -26,14 +26,15 @@
                 "php": "^5.3.2 || ^7.0 || ^8.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || 6.5 - 8",
+                "phpstan/phpstan": "^0.12.55",
                 "psr/log": "^1.0",
+                "symfony/phpunit-bridge": "^4.2 || ^5",
                 "symfony/process": "^2.5 || ^3.0 || ^4.0 || ^5.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.x-dev"
+                    "dev-main": "1.x-dev"
                 }
             },
             "autoload": {
@@ -74,7 +75,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-08-23T12:54:47+00:00"
+            "time": "2021-01-12T12:10:35+00:00"
         },
         {
             "name": "danielstjules/stringy",
@@ -132,6 +133,77 @@
             ],
             "time": "2015-07-23T00:54:12+00:00"
         },
+        {
+            "name": "doctrine/annotations",
+            "version": "1.11.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/annotations.git",
+                "reference": "ce77a7ba1770462cd705a91a151b6c3746f9c6ad"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/annotations/zipball/ce77a7ba1770462cd705a91a151b6c3746f9c6ad",
+                "reference": "ce77a7ba1770462cd705a91a151b6c3746f9c6ad",
+                "shasum": ""
+            },
+            "require": {
+                "doctrine/lexer": "1.*",
+                "ext-tokenizer": "*",
+                "php": "^7.1 || ^8.0"
+            },
+            "require-dev": {
+                "doctrine/cache": "1.*",
+                "doctrine/coding-standard": "^6.0 || ^8.1",
+                "phpstan/phpstan": "^0.12.20",
+                "phpunit/phpunit": "^7.5 || ^9.1.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.11.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Common\\Annotations\\": "lib/Doctrine/Common/Annotations"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Guilherme Blanco",
+                    "email": "guilhermeblanco@gmail.com"
+                },
+                {
+                    "name": "Roman Borschel",
+                    "email": "roman@code-factory.org"
+                },
+                {
+                    "name": "Benjamin Eberlei",
+                    "email": "kontakt@beberlei.de"
+                },
+                {
+                    "name": "Jonathan Wage",
+                    "email": "jonwage@gmail.com"
+                },
+                {
+                    "name": "Johannes Schmitt",
+                    "email": "schmittjoh@gmail.com"
+                }
+            ],
+            "description": "Docblock Annotations Parser",
+            "homepage": "https://www.doctrine-project.org/projects/annotations.html",
+            "keywords": [
+                "annotations",
+                "docblock",
+                "parser"
+            ],
+            "time": "2020-10-26T10:28:16+00:00"
+        },
         {
             "name": "doctrine/cache",
             "version": "1.10.2",
@@ -229,146 +301,32 @@
             "time": "2020-07-07T18:54:01+00:00"
         },
         {
-            "name": "doctrine/dbal",
-            "version": "2.11.1",
+            "name": "doctrine/collections",
+            "version": "1.6.7",
             "source": {
                 "type": "git",
-                "url": "https://github.com/doctrine/dbal.git",
-                "reference": "6e6903cd5e3a5be60a79439e3ee8fe126f78fe86"
+                "url": "https://github.com/doctrine/collections.git",
+                "reference": "55f8b799269a1a472457bd1a41b4f379d4cfba4a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/dbal/zipball/6e6903cd5e3a5be60a79439e3ee8fe126f78fe86",
-                "reference": "6e6903cd5e3a5be60a79439e3ee8fe126f78fe86",
+                "url": "https://api.github.com/repos/doctrine/collections/zipball/55f8b799269a1a472457bd1a41b4f379d4cfba4a",
+                "reference": "55f8b799269a1a472457bd1a41b4f379d4cfba4a",
                 "shasum": ""
             },
             "require": {
-                "doctrine/cache": "^1.0",
-                "doctrine/event-manager": "^1.0",
-                "ext-pdo": "*",
-                "php": "^7.3"
-            },
-            "require-dev": {
-                "doctrine/coding-standard": "^8.1",
-                "jetbrains/phpstorm-stubs": "^2019.1",
-                "nikic/php-parser": "^4.4",
-                "phpstan/phpstan": "^0.12.40",
-                "phpunit/phpunit": "^9.3",
-                "psalm/plugin-phpunit": "^0.10.0",
-                "symfony/console": "^2.0.5|^3.0|^4.0|^5.0",
-                "vimeo/psalm": "^3.14.2"
-            },
-            "suggest": {
-                "symfony/console": "For helpful console commands such as SQL execution and import of files."
-            },
-            "bin": [
-                "bin/doctrine-dbal"
-            ],
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "4.0.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Doctrine\\DBAL\\": "lib/Doctrine/DBAL"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Guilherme Blanco",
-                    "email": "guilhermeblanco@gmail.com"
-                },
-                {
-                    "name": "Roman Borschel",
-                    "email": "roman@code-factory.org"
-                },
-                {
-                    "name": "Benjamin Eberlei",
-                    "email": "kontakt@beberlei.de"
-                },
-                {
-                    "name": "Jonathan Wage",
-                    "email": "jonwage@gmail.com"
-                }
-            ],
-            "description": "Powerful PHP database abstraction layer (DBAL) with many features for database schema introspection and management.",
-            "homepage": "https://www.doctrine-project.org/projects/dbal.html",
-            "keywords": [
-                "abstraction",
-                "database",
-                "db2",
-                "dbal",
-                "mariadb",
-                "mssql",
-                "mysql",
-                "oci8",
-                "oracle",
-                "pdo",
-                "pgsql",
-                "postgresql",
-                "queryobject",
-                "sasql",
-                "sql",
-                "sqlanywhere",
-                "sqlite",
-                "sqlserver",
-                "sqlsrv"
-            ],
-            "funding": [
-                {
-                    "url": "https://www.doctrine-project.org/sponsorship.html",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://www.patreon.com/phpdoctrine",
-                    "type": "patreon"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Fdbal",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2020-09-27T04:09:41+00:00"
-        },
-        {
-            "name": "doctrine/event-manager",
-            "version": "1.1.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/doctrine/event-manager.git",
-                "reference": "41370af6a30faa9dc0368c4a6814d596e81aba7f"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/event-manager/zipball/41370af6a30faa9dc0368c4a6814d596e81aba7f",
-                "reference": "41370af6a30faa9dc0368c4a6814d596e81aba7f",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.1 || ^8.0"
-            },
-            "conflict": {
-                "doctrine/common": "<2.9@dev"
+                "php": "^7.1.3 || ^8.0"
             },
             "require-dev": {
                 "doctrine/coding-standard": "^6.0",
-                "phpunit/phpunit": "^7.0"
+                "phpstan/phpstan-shim": "^0.9.2",
+                "phpunit/phpunit": "^7.0",
+                "vimeo/psalm": "^3.8.1"
             },
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0.x-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
-                    "Doctrine\\Common\\": "lib/Doctrine/Common"
+                    "Doctrine\\Common\\Collections\\": "lib/Doctrine/Common/Collections"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -395,36 +353,161 @@
                 {
                     "name": "Johannes Schmitt",
                     "email": "schmittjoh@gmail.com"
-                },
-                {
-                    "name": "Marco Pivetta",
-                    "email": "ocramius@gmail.com"
                 }
             ],
-            "description": "The Doctrine Event Manager is a simple PHP event system that was built to be used with the various Doctrine projects.",
-            "homepage": "https://www.doctrine-project.org/projects/event-manager.html",
+            "description": "PHP Doctrine Collections library that adds additional functionality on top of PHP arrays.",
+            "homepage": "https://www.doctrine-project.org/projects/collections.html",
             "keywords": [
-                "event",
-                "event dispatcher",
-                "event manager",
-                "event system",
-                "events"
+                "array",
+                "collections",
+                "iterators",
+                "php"
             ],
-            "funding": [
+            "time": "2020-07-27T17:53:49+00:00"
+        },
+        {
+            "name": "doctrine/common",
+            "version": "v2.7.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/common.git",
+                "reference": "4acb8f89626baafede6ee5475bc5844096eba8a9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/common/zipball/4acb8f89626baafede6ee5475bc5844096eba8a9",
+                "reference": "4acb8f89626baafede6ee5475bc5844096eba8a9",
+                "shasum": ""
+            },
+            "require": {
+                "doctrine/annotations": "1.*",
+                "doctrine/cache": "1.*",
+                "doctrine/collections": "1.*",
+                "doctrine/inflector": "1.*",
+                "doctrine/lexer": "1.*",
+                "php": "~5.6|~7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^5.4.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.7.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Common\\": "lib/Doctrine/Common"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
                 {
-                    "url": "https://www.doctrine-project.org/sponsorship.html",
-                    "type": "custom"
+                    "name": "Roman Borschel",
+                    "email": "roman@code-factory.org"
                 },
                 {
-                    "url": "https://www.patreon.com/phpdoctrine",
-                    "type": "patreon"
+                    "name": "Benjamin Eberlei",
+                    "email": "kontakt@beberlei.de"
                 },
                 {
-                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Fevent-manager",
-                    "type": "tidelift"
+                    "name": "Guilherme Blanco",
+                    "email": "guilhermeblanco@gmail.com"
+                },
+                {
+                    "name": "Jonathan Wage",
+                    "email": "jonwage@gmail.com"
+                },
+                {
+                    "name": "Johannes Schmitt",
+                    "email": "schmittjoh@gmail.com"
                 }
             ],
-            "time": "2020-05-29T18:28:51+00:00"
+            "description": "Common Library for Doctrine projects",
+            "homepage": "http://www.doctrine-project.org",
+            "keywords": [
+                "annotations",
+                "collections",
+                "eventmanager",
+                "persistence",
+                "spl"
+            ],
+            "time": "2017-07-22T08:35:12+00:00"
+        },
+        {
+            "name": "doctrine/dbal",
+            "version": "v2.5.11",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/dbal.git",
+                "reference": "1b1effbddbdc0f40d1c8f849f44bcddac4f52a48"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/dbal/zipball/1b1effbddbdc0f40d1c8f849f44bcddac4f52a48",
+                "reference": "1b1effbddbdc0f40d1c8f849f44bcddac4f52a48",
+                "shasum": ""
+            },
+            "require": {
+                "doctrine/common": ">=2.4,<2.8-dev",
+                "php": ">=5.3.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "4.*",
+                "symfony/console": "2.*||^3.0"
+            },
+            "suggest": {
+                "symfony/console": "For helpful console commands such as SQL execution and import of files."
+            },
+            "bin": [
+                "bin/doctrine-dbal"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.5.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Doctrine\\DBAL\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Roman Borschel",
+                    "email": "roman@code-factory.org"
+                },
+                {
+                    "name": "Benjamin Eberlei",
+                    "email": "kontakt@beberlei.de"
+                },
+                {
+                    "name": "Guilherme Blanco",
+                    "email": "guilhermeblanco@gmail.com"
+                },
+                {
+                    "name": "Jonathan Wage",
+                    "email": "jonwage@gmail.com"
+                }
+            ],
+            "description": "Database Abstraction Layer",
+            "homepage": "http://www.doctrine-project.org",
+            "keywords": [
+                "database",
+                "dbal",
+                "persistence",
+                "queryobject"
+            ],
+            "time": "2017-02-04T21:20:13+00:00"
         },
         {
             "name": "doctrine/inflector",
@@ -518,6 +601,82 @@
             ],
             "time": "2020-05-29T07:19:59+00:00"
         },
+        {
+            "name": "doctrine/lexer",
+            "version": "1.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/lexer.git",
+                "reference": "e864bbf5904cb8f5bb334f99209b48018522f042"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/lexer/zipball/e864bbf5904cb8f5bb334f99209b48018522f042",
+                "reference": "e864bbf5904cb8f5bb334f99209b48018522f042",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "require-dev": {
+                "doctrine/coding-standard": "^6.0",
+                "phpstan/phpstan": "^0.11.8",
+                "phpunit/phpunit": "^8.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.2.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Common\\Lexer\\": "lib/Doctrine/Common/Lexer"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Guilherme Blanco",
+                    "email": "guilhermeblanco@gmail.com"
+                },
+                {
+                    "name": "Roman Borschel",
+                    "email": "roman@code-factory.org"
+                },
+                {
+                    "name": "Johannes Schmitt",
+                    "email": "schmittjoh@gmail.com"
+                }
+            ],
+            "description": "PHP Doctrine Lexer parser library that can be used in Top-Down, Recursive Descent Parsers.",
+            "homepage": "https://www.doctrine-project.org/projects/lexer.html",
+            "keywords": [
+                "annotations",
+                "docblock",
+                "lexer",
+                "parser",
+                "php"
+            ],
+            "funding": [
+                {
+                    "url": "https://www.doctrine-project.org/sponsorship.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.patreon.com/phpdoctrine",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Flexer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-05-25T17:44:05+00:00"
+        },
         {
             "name": "geoip2/geoip2",
             "version": "v2.11.0",
@@ -2227,26 +2386,26 @@
         },
         {
             "name": "maxmind-db/reader",
-            "version": "v1.8.0",
+            "version": "v1.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/maxmind/MaxMind-DB-Reader-php.git",
-                "reference": "b566d429ac9aec10594b0935be8ff38302f8d5c8"
+                "reference": "9ee9ba9ee287b119e9f5a8e8dbfea0b49647cec4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/maxmind/MaxMind-DB-Reader-php/zipball/b566d429ac9aec10594b0935be8ff38302f8d5c8",
-                "reference": "b566d429ac9aec10594b0935be8ff38302f8d5c8",
+                "url": "https://api.github.com/repos/maxmind/MaxMind-DB-Reader-php/zipball/9ee9ba9ee287b119e9f5a8e8dbfea0b49647cec4",
+                "reference": "9ee9ba9ee287b119e9f5a8e8dbfea0b49647cec4",
                 "shasum": ""
             },
             "require": {
                 "php": ">=7.2"
             },
             "conflict": {
-                "ext-maxminddb": "<1.8.0,>=2.0.0"
+                "ext-maxminddb": "<1.9.0,>=2.0.0"
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