One of my regular players had this situation:
He was running in caves with 0 sanity with bunch of nightmares after him. He put on bone helmet and used cave stairs to go up. At that point Cave Shard crashed and created me logs attached related to game not being able to find player's location for Terrobreak spawning (i think)
please see logs.
Steps to Reproduce
go crazy, put on bone helm in caves, use stairs up.
This issue has been fixed in either a future version or updated in a previous version.