Conflict with Visual Composer (Uncode theme)

Hi, great plugin but after activating it, it stopped the text block element working in Visual Composer/WP Bakery Page Builder (this is the version that ships with the Uncode theme). The text is missing in the text block editor so it cannot be edited, and the editor icons are not displaying. When Yop poll is deactivated, the text block element works fine again, so I guess there’s some kind of conflict.

Not sure if related but when Yop Poll is active, I can see this error in Google Chrome’s Console:

ot-admin.min.js?ver=2.5.4:1 Uncaught TypeError: Cannot read property ‘toString’ of undefined
at ot-admin.min.js?ver=2.5.4:1
at ot-admin.min.js?ver=2.5.4:1

(this is in a theme folder)

The theme, plugins etc are all up to date.

Any help greatly appreciated thanks.