diff --git a/browser_patches/firefox/BUILD_NUMBER b/browser_patches/firefox/BUILD_NUMBER
index 822fe6349f..79e6287b6a 100644
--- a/browser_patches/firefox/BUILD_NUMBER
+++ b/browser_patches/firefox/BUILD_NUMBER
@@ -1 +1 @@
-1117
+1118
diff --git a/browser_patches/firefox/juggler/content/Runtime.js b/browser_patches/firefox/juggler/content/Runtime.js
index 2a3feb5336..8051339472 100644
--- a/browser_patches/firefox/juggler/content/Runtime.js
+++ b/browser_patches/firefox/juggler/content/Runtime.js
@@ -132,7 +132,7 @@ class Runtime {
           return;
         }
         const errorWindow = Services.wm.getOuterWindowWithId(message.outerWindowID);
-        if (message.category === 'Web Worker' && (message.flags & Ci.nsIScriptError.exceptionFlag)) {
+        if (message.category === 'Web Worker' && message.logLevel === Ci.nsIConsoleMessage.error) {
           emitEvent(this.events.onErrorFromWorker, errorWindow, message.message, '' + message.stack);
           return;
         }