Crash when removing object

[Theverat]

I'm not sure yet if this is a bug in the Blender addon or in LuxCore, would be glad if you could take a look at it:

Scene: local_view_crash4.zip

Steps to reproduce:

• Open file
• Press "H" to hide the already selected object (this will call luxcore_scene.DeleteObject())
• Blender crashes

Only happens with PathOCL (tested with OpenCL device).

In the log, I get ERROR: Reference to an undefined NamedObject pointer: 0x7f5d8aad2640:

[LuxCore][7.777] Compile 2 Textures
[LuxCore][7.777] Texture evaluation ops count: 6
[LuxCore][7.777] Texture evaluation max. stack size: 3
[LuxCore][7.777] Textures compilation time: 0ms
[LuxCore][7.777] Compile 2 Materials
Traceback (most recent call last):
  File "/home/simon/.config/blender/2.82/scripts/addons/BlendLuxCore_git/export/__init__.py", line 331, in update
    session.EndSceneEdit()
RuntimeError: Reference to an undefined NamedObject pointer: 0x7f943bcfea40
ERROR: Reference to an undefined NamedObject pointer: 0x7f943bcfea40
[SDL][7.778] Light definition: __SAVIOR__
[LuxCore][7.825] Compile Lights
[LuxCore][7.825] Lights compilation time: 0ms
view_update(): applying changes took 143.3 ms
view_update() took 144.0 ms
Writing: /tmp/local_view_crash4.crash.txt
fish: “/home/simon/programs/blender-2.…” terminated by signal SIGSEGV (Address boundary error)

• When I don't use RemoveUnusedTextures() here, the crash does not happen - maybe a bug in the code checking for referenced textures?
• When I use PathCPU instead of PathOCL, the crash does not happen

LuxCore version: 93de161
Addon version: LuxCoreRender/BlendLuxCore@0befe38

[Theverat]

I think this is a case of two interleaved bugs:

1. Something goes wrong either in LuxCore or the addon leading to the RuntimeError: Reference to an undefined NamedObject pointer: 0x7f943bcfea40 error. The cause could be a bug in RemoveUnusedTextures()
2. EndSceneEdit() is called after the RuntimeError, leading to the crash (I guess this is not a bug?). Not sure how I can recover from errors that happen after BeginSceneEdit() without crashing, is this possible?

[Dade916]

It was a problem with Volumes. It should now work fine.