diff --git a/lib/scripts/toolbar.js b/lib/scripts/toolbar.js
index 37987c21a407184cfc8b2c4ed66674c231ea4194..3f967448cecea185f2ec86bad060f89b029e8764 100644
--- a/lib/scripts/toolbar.js
+++ b/lib/scripts/toolbar.js
@@ -18,6 +18,10 @@ function initToolbar(tbid,edid,tb, allowblock){
     if(!edit) return;
     if(edit.readOnly) return;
 
+    if (typeof allowblock === 'undefined') {
+        allowblock = true;
+    }
+
     //empty the toolbar area:
     toolbar.innerHTML='';