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2.8x Crash when loading 2.79 file
Closed, ResolvedPublicBUG


System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.87

Blender Version
Broken: version: 2.83.6, branch: master, commit date: 2020-09-09 07:32, hash: rB8610c697773e
Worked: (newest version of Blender that worked as expected)

Short description of error
Blender 2.8x crash when loading a 2.79 blend file
I made some tests and think that the crash is related to group and group instance.

Exact steps for others to reproduce the error
Load Crash_with_empty.blend (who is a 2.79 blend) in Blender 2.8x and he will crash.
The .blend is very light with just a group instancier and a group who contains an empty.

You can also load Ok_with_mesh.blend who is the same configuration but with a mesh in the group; and this time it well be fine.

I have this issue on multiple windows machine (i have not test on Linux or Mac)

Post Scriptum
I work for a company that has been using Blender for years at a rate of around 100 renderings per day. We recently upgraded to Blender version 2.83.x.
Blender 2.79 was great, next versions could be even better.
So let's do it together!


Event Timeline

Hans Goudey (HooglyBoogly) changed the task status from Needs Triage to Confirmed.Sep 25 2020, 8:31 PM
Hans Goudey (HooglyBoogly) changed the subtype of this task from "Report" to "Bug".

Thanks for the report. I can confirm the crash when opening your file.

The crash happens in the versioning code that updates the blend file for 2.80.

This also causes an assert in debug mode:
BLI_assert(collection_hidden != NULL);

Not sure how you created that file, but it is not a valid one, in that your Empty object in the group is not instantiated in any scene, which should never happen.

Will fix the doversion code to cope with that situation though.