Just started experiencing this when closing the editor. Looking up the issue, I believe it is related to UE-63194
Getting it to occur has been sporadic. I run my project, let it sit for a few seconds, then close the editor – the crash occurs maybe 30% of the time? There isn’t anything specific I’m doing in the editor to cause it, as far as I can tell.
The breakpoint occurs in void FMemory::Free(void* Original), and it looks like it’s stemming from RenderingThread.cpp line 1296:
which pretty much matches what UE-63194 states. I have no idea if any of this helps, but I thought I’d post here like the crash report suggested.