Uncaught TypeError: Cannot read property ‘replace’ of undefined

Hi there,

I’m having intermittent issues with the Gallery option. Sometimes it works fine, and other times clicking on thumbnails throws an error in the console:

Uncaught TypeError: Cannot read property ‘replace’ of undefined from line 248 of ytprefs.min.js

I can’t seem to figure out what’s causing it or why is it that sometimes it works fine and other times it doesn’t. I tried disabling Cloudflare, and W3TC, but it makes no difference.

I’d appreciate any pointers on where to look for a fix.

Thanks