Ticket #4028: 4028_4_postfix.patch

_source/core/ui.js

@@ -67 +67 @@
         {
                 var item        = this._.items[ name ],
                         handler = item && this._.handlers[ item.type ],
-                        command = item.command && this._.editor.getCommand( item.command );
+                        command = item && item.command && this._.editor.getCommand( item.command );
 
                 var result = handler && handler.create.apply( this, item.args );