Posts won't scroll

Hi there – first off, great plugin! Never had any problems until now, but I recently upgraded and unfortunately it doesn’t appear to be scrolling any more. It will show the first post in the selected category, but it never moves past that.

Here’s the only JS error I am getting:
TypeError: n.indexOf is not a function
if ( n.indexOf( ‘vsrp_id’ ) > -1 )

Any help would be greatly appreciated – just let me know if you need any more info from me. Thanks!

https://wordpress.org/plugins/vertical-scroll-recent-post/