Problem with VC / Newsblock

I’m not sure why, but for months I’ve had this issue where if I update or post a new blogpost or something on my site, any part of my site that has a newsblock will receive a Error 500 webpage…

I’ve made a small video basically showing the error. There’s no problem with my PHP memory limit, nor my .htaccess, I’ve tried replacing the Visual Composer plugin and checked permissions. There’s nothing wrong from my end, this seems to be an issue with VC and its shortcodes. For some reason it’s only affecting the custom shortcodes for Arcane.

What do I do?