From b061db229e39f94cd6748084acfd1f382a1afe16 Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Mon, 30 Oct 2023 10:44:04 -0400
Subject: [PATCH] Prevent `contentScripts.register` from throwing

Related issue:
https://github.com/uBlockOrigin/uBlock-issues/issues/2915
---
 src/js/scriptlet-filtering.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/js/scriptlet-filtering.js b/src/js/scriptlet-filtering.js
index 037f399e0..910905346 100644
--- a/src/js/scriptlet-filtering.js
+++ b/src/js/scriptlet-filtering.js
@@ -78,6 +78,7 @@ const contentScriptRegisterer = new (class {
     }
     register(hostname, code) {
         if ( browser.contentScripts === undefined ) { return false; }
+        if ( hostname === '' ) { return false; }
         const details = this.hostnameToDetails.get(hostname);
         if ( details !== undefined ) {
             if ( code === details.code ) {
@@ -94,6 +95,8 @@ const contentScriptRegisterer = new (class {
             runAt: 'document_start',
         }).then(handle => {
             this.hostnameToDetails.set(hostname, { handle, code });
+        }).catch(( ) => {
+            this.hostnameToDetails.delete(hostname);
         });
         this.hostnameToDetails.set(hostname, { handle: promise, code });
         return false;