sajty/ember — comment on commit 140459875b2dcad32a0ea0d341fda453b79b65ba
File: src/components/ogre/EmberEntity.cpp line 68
By erikhjortsberg:

This is not needed, since it's an error if anything tries to use the object after it's been deleted.
As such it's actually better to leave the pointers in their place, since it's then easier to detect these cases.

So, in this case the error seems to be that something is holding on to a reference to the entity even after it's been deleted. From the stack trace it seems to be an issue where the terrain is shut down while there's still an ongoing terrain updating task occurring in a separate thread. I can take a closer look.