Hi.
Thanks for your fast reply!
I think I just resolved it…
But I just tested it a little further and saw, that the error happens when I click on a Add to Cart Link.
I am using the “Merge, Minify and Refresh” Plugin… deactivating that resolved the issue… and I just updated it, and I think that also did the trick.
Let’s see..
P.S.: This is the URL: https://shop.pkm-muldenzentrale.at
Sean.