Did anybody try to delete anything in prisma (that has a relational field)? https://github.com/graphcool/prisma/issues/1795 This is so basic, i assume the error should be on my side somehow.

Yeah, I thought so. But it seems it's actually a bug in Prisma. In graphcool framework it worked ok.

I can confirm that this looks like a bug 🙂 we'll take a look at this soon!