diff --git a/app/assets/javascripts/sitewide/marvinjs_editor.js b/app/assets/javascripts/sitewide/marvinjs_editor.js
index 1a1ae02eb..1290e0963 100644
--- a/app/assets/javascripts/sitewide/marvinjs_editor.js
+++ b/app/assets/javascripts/sitewide/marvinjs_editor.js
@@ -321,6 +321,7 @@ $(document).on('click', '.gene-sequence-edit-button', function() {
 function initMarvinJs() {
   if (typeof (ChemicalizeMarvinJs) === 'undefined') {
     setTimeout(initMarvinJs, 100);
+    return;
   }
 
   MarvinJsEditor = MarvinJsEditorApi();