Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff

I can’t open my project anymore, everytime when trying to load the map UEFN crashes. Yesterday it helped to delete some folders (AppData → Local → UnrealEngineFortnite → Intermediate & Saved) and reopen the project, but now it doesn’t anymore.
I also re-installed the project and the editor, updated the nvidia driver and set 3D settings to default, but it still doesn’t work.
Does anyone have an idea why this happens?

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