my guess without reading any code is that

User

probably has null built into its type.

doesn’t look like it to me

That is odd. I can’t reproduce this locally. Can you please report this here: https://github.com/prisma/prisma/issues/new?assignees=&labels=kind%2Fbug&template=bug_report.yml

happy to - is there anything in my generated

index.d.ts

that would be useful to include in the report?

That should not be necessary. Just include your schema and a sample call which is reproducing the problem. Here is an example of how you can prepare the reproduction: https://github.com/harshit-test-org/prisma-issue-11641

fyi i think it’s the same as this