This is a common engine crash that has occurred since at least 4.16. Users have not provided any useful descriptions of their actions when the crash occurred.
The callstack shares some similarities to [Link Removed]. The callstack is also frequently seen in an Ensure that shares the same crashGroup, and the error message of that Ensure references Object->IsValidLowLevelFast, which again is similar to [Link Removed].
repro steps currently unknown
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-51952 in the post.