diff --git a/app/Export/CSV/BaseExport.php b/app/Export/CSV/BaseExport.php
index 9b606b07c8..9d704574d9 100644
--- a/app/Export/CSV/BaseExport.php
+++ b/app/Export/CSV/BaseExport.php
@@ -501,6 +501,8 @@ class BaseExport
         foreach (array_merge($this->input['report_keys'], $this->forced_keys) as $value) {
 
             $key = array_search($value, $this->entity_keys);
+            
+            $prefix = '';
 
             if(!$key) {
                 $prefix = stripos($value, 'client.') !== false ? ctrans('texts.client') : ctrans('texts.contact');
diff --git a/phpstan.neon b/phpstan.neon
index 02983dff19..ab6b693654 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -2,9 +2,11 @@ includes:
     - ./vendor/nunomaduro/larastan/extension.neon
 
 parameters:
-	parallel:
-		processTimeout: 300.0
     treatPhpDocTypesAsCertain: false
+	parallel:
+        jobSize: 20
+        maximumNumberOfProcesses: 2
+		processTimeout: 300.0
     ignoreErrors:
         - '#Call to an undefined method .*badMethod\(\)#'
         - '#Call to an undefined method Illuminate\Database\Eloquent\Builder::exclude#'