Plugin causing JavaScript Errors

I’m using Formidable Forms plugin on my site and WP Fastest Cache is causing JavaScript errors:

Error: no such method ‘show’ for tooltip widget instance
http://photochambersgallery.co.uk/wp-admin/load-scripts.php?c=0&load%5B%5D=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-progressbar,jquery-ui-mouse,jquery-ui-resizable,jquer&load%5B%5D=y-ui-draggable,jquery-ui-button,jquery-ui-position,jquery-ui-dialog&ver=4.3.1
Line 2

I have spoken to them and they are sure the JS error is in your plugin.
In the mean-time I have excluded FF pages from being cached but, I thought it may be helpful if I brought this to your attention.

https://ww.wp.xz.cn/plugins/wp-fastest-cache/