diff --git a/assets/resources/scriptlets.js b/assets/resources/scriptlets.js
index 5248ff6d6..bb314b6aa 100644
--- a/assets/resources/scriptlets.js
+++ b/assets/resources/scriptlets.js
@@ -253,6 +253,7 @@ function abortCurrentScriptCore(
     for (;;) {
         prop = chain.shift();
         if ( chain.length === 0 ) { break; }
+        if ( prop in owner === false ) { break; }
         owner = owner[prop];
         if ( owner instanceof Object === false ) { return; }
     }