galleries disappeared in dashboard

Hi there,

The website – https://heritageslateroofing.com.au/
has over 30 Galleries throughout it. We noticed that one of the Project pages that had a gallery was not loading. I looked in the error log, I looked in dev tools but I cannot figure out what the issue is. If I switch off Gallery by Supsystic the page loads fine. When you are in the dashboard for Gallery by Supsystic it says there has been a cirtical error on your website. But there is no critical error elsewhere it is just in supsystic.

Critical Error in Supsystic dashboard

I edited the page where the gallery was not loading – literally just copied and pasted the same 2 lines of code / writing it had on it, clicked save and then it reappeared front end. But in the Supsystic dashboard I still cannot see the other 30 galleries.

Any ideas / help is much appreciated, thank you.