diff --git a/classes/eval/em_javascript.js b/classes/eval/em_javascript.js
index 8b552c72b20..93c8cc480f9 100644
--- a/classes/eval/em_javascript.js
+++ b/classes/eval/em_javascript.js
@@ -234,6 +234,7 @@ function LEMval(alias)
     }
     if (whichJsName === null || typeof document.getElementById(whichJsName) === 'undefined' || document.getElementById(whichJsName) === null) {
         an_error = true;    // this line is here to make debugging easier
+        return '';
     }
 
     // values should always be stored encoded with htmlspecialchars()