Blender sudden quit while saving lightmaps

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**Description**
After baking lightmaps, while lightmaps is being saved to external files or when apply is hit, Blender quits.

**To Reproduce**
Bake lightmaps. Wait while it's saving, or hit apply.

**Expected behavior**
The lightmap is saved.

**System**
Blender: 2.83LTS
Armory: 2020-10(Latest git version)
OS: Windows 10 64bit
Graphics card: gtx1650ti

**Test File**
A blend scene with fbx Sun Temple scene imported.
https://developer.nvidia.com/ue4-sun-temple

No repository file or test is identified. Start by reproducing the crash with Blender 2.83 LTS on Windows 10 using the linked NVIDIA Sun Temple scene, during lightmap saving and Apply. Done means the lightmap is saved without Blender quitting.

Written by the indexing model from the issue text.