diff --git a/browser/devtools/highlighter/inspector.jsm b/browser/devtools/highlighter/inspector.jsm
index c5187b822d20..67f1883009db 100644
--- a/browser/devtools/highlighter/inspector.jsm
+++ b/browser/devtools/highlighter/inspector.jsm
@@ -2220,7 +2220,9 @@ InspectorProgressListener.prototype = {
             aRequest.resume();
             aRequest = null;
             this.IUI.closeInspectorUI();
+            return true;
           }
+          return false;
         }.bind(this),
       },
       {