[Plugin: NextGEN Gallery] No galleries in admin

In the ‘manage gallery’ section in the admin of my website, I don’t see any of my galleries anymore (since this week).
I do have a few galleries, which you can see on my site: https://www.kbo-heeze.nl/fotogalerij/

I hope you can help me, because now I can’t change any of the galleries anymore.

Thanks!
Angela

https://www.ads-software.com/extend/plugins/nextgen-gallery/