diff --git a/lib/scripts/script.js b/lib/scripts/script.js
index ddc88c7287ac41d8f742a094ed50bdb1ac6f00d7..fd2679f0169e137e1b9c08ad00ceef09b0142c17 100644
--- a/lib/scripts/script.js
+++ b/lib/scripts/script.js
@@ -17,6 +17,9 @@ if (clientPC.indexOf('opera')!=-1) {
     var is_opera_seven = (window.opera && document.childNodes);
 }
 
+// prepare empty toolbar for checks by lazy plugins
+var toolbar = '';
+
 /**
  * Rewrite the accesskey tooltips to be more browser and OS specific.
  *