Curve tools: Crash on undo operation #93189

New Issue

System Information
Operating system: Windows-10-10.0.19042-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12

Blender Version
Broken: version: 3.1.0 Alpha, branch: master, commit date: 2021-11-14 00:26, hash: blender/blender@7e82c840b7
Worked: (newest version of Blender that worked as expected)

Addon Information
Name: Curve Tools (0, 4, 5)
Author: Mackraken

Short description of error
Undoing a biral crashes blender

Exact steps for others to reproduce the error

Select 3 curves click on birail or select 2 curves {nav Surfaces > Loft}
Press {key Ctrl z} (undo)

Crash

Test File:
Curves.blend

**System Information** Operating system: Windows-10-10.0.19042-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12 **Blender Version** Broken: version: 3.1.0 Alpha, branch: master, commit date: 2021-11-14 00:26, hash: `blender/blender@7e82c840b7` Worked: (newest version of Blender that worked as expected) **Addon Information** Name: Curve Tools (0, 4, 5) Author: Mackraken **Short description of error** Undoing a biral crashes blender **Exact steps for others to reproduce the error** - Select 3 curves click on birail **or** select 2 curves {nav Surfaces > Loft} - Press {key Ctrl z} (undo) # Crash Test File: [Curves.blend](https://archive.blender.org/developer/F11825316/Curves.blend)

#93057 was marked as duplicate of this issue

Added subscriber: @Royston

Heres a test file.Curves.blend

Heres a test file.[Curves.blend](https://archive.blender.org/developer/F11825316/Curves.blend)

Added subscriber: @PratikPB2123

Changed status from 'Needs Triage' to: 'Confirmed'

Hi, thanks for the report. I can reproduce the crash on master: b8dc845e5733a281e86e9ecc0fac5580699a14e1

blender.exe         :0x00007FF6CAADBC90  BKE_scene_set_background
blender.exe         :0x00007FF6CFE67660  setup_app_data
blender.exe         :0x00007FF6CFE66B10  BKE_blendfile_read_setup
blender.exe         :0x00007FF6CFF33A60  BKE_memfile_undo_decode
blender.exe         :0x00007FF6CB5CF840  memfile_undosys_step_decode
blender.exe         :0x00007FF6CFE66670  undosys_step_decode
blender.exe         :0x00007FF6CFE65B80  BKE_undosys_step_load_data_ex
blender.exe         :0x00007FF6CFE66440  BKE_undosys_step_undo
blender.exe         :0x00007FF6CB5D0E70  ed_undo_step_direction
blender.exe         :0x00007FF6CB5D0C40  ed_undo_exec
blender.exe         :0x00007FF6CACE26E0  wm_operator_invoke
blender.exe         :0x00007FF6CACE02D0  wm_handler_operator_call
blender.exe         :0x00007FF6CACE1AF0  wm_handlers_do_keymap_with_keymap_handler
blender.exe         :0x00007FF6CACE12C0  wm_handlers_do_intern
blender.exe         :0x00007FF6CACE08F0  wm_handlers_do
blender.exe         :0x00007FF6CACDD9C0  wm_event_do_handlers
blender.exe         :0x00007FF6CACC7B10  WM_main
blender.exe         :0x00007FF6CA93F170  main
blender.exe         :0x00007FF6CFE5F5C8  __scrt_common_main_seh
KERNEL32.DLL        :0x00007FF8C7297020  BaseThreadInitThunk
ntdll.dll           :0x00007FF8C7662630  RtlUserThreadStart```

Hi, thanks for the report. I can reproduce the crash on master: `b8dc845e5733a281e86e9ecc0fac5580699a14e1` ```lines blender.exe :0x00007FF6CAADBC90 BKE_scene_set_background blender.exe :0x00007FF6CFE67660 setup_app_data blender.exe :0x00007FF6CFE66B10 BKE_blendfile_read_setup blender.exe :0x00007FF6CFF33A60 BKE_memfile_undo_decode blender.exe :0x00007FF6CB5CF840 memfile_undosys_step_decode blender.exe :0x00007FF6CFE66670 undosys_step_decode blender.exe :0x00007FF6CFE65B80 BKE_undosys_step_load_data_ex blender.exe :0x00007FF6CFE66440 BKE_undosys_step_undo blender.exe :0x00007FF6CB5D0E70 ed_undo_step_direction blender.exe :0x00007FF6CB5D0C40 ed_undo_exec blender.exe :0x00007FF6CACE26E0 wm_operator_invoke blender.exe :0x00007FF6CACE02D0 wm_handler_operator_call blender.exe :0x00007FF6CACE1AF0 wm_handlers_do_keymap_with_keymap_handler blender.exe :0x00007FF6CACE12C0 wm_handlers_do_intern blender.exe :0x00007FF6CACE08F0 wm_handlers_do blender.exe :0x00007FF6CACDD9C0 wm_event_do_handlers blender.exe :0x00007FF6CACC7B10 WM_main blender.exe :0x00007FF6CA93F170 main blender.exe :0x00007FF6CFE5F5C8 __scrt_common_main_seh KERNEL32.DLL :0x00007FF8C7297020 BaseThreadInitThunk ntdll.dll :0x00007FF8C7662630 RtlUserThreadStart```

Added subscriber: @ericsego

This issue was referenced by 7685aa17ce

This issue was referenced by 7685aa17ce3d01264797245729d7c3b2ddcb43d4

This issue was referenced by 94ebaf0492

This issue was referenced by 94ebaf04922906924e26761b9cf408daf34c6aeb

Changed status from 'Confirmed' to: 'Resolved'

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Curve tools: Crash on undo operation #93189

Crash