Error With Ajax Load

I had an error when I clicked on Mega Menu link in the Menu Bulder.
The Ajax load in the pop up froze and
Uncaught Syntax Error: Unexpected Token <

I had a look and turned out it was that ‘description’ was unidentified key in

line 242
'description' => $widget->widget_options['description']

in widget-manager.class.php

I commented out the line and all is working fine

thank you for the Plugin

https://wordpress.org/plugins/megamenu/