System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1650 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: rB0f45cab862b8
Worked: 2.90 and in 2.92 alpha

Addon Information
Name: Icon Viewer (1, 4, 0)
Author: roaoao

Short description of error
Here is in 2.90.