**System Information**
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Intel(R) UHD Graphics Intel 4.5.0 - Build 26.20.100.6911
**Blender Version**
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: `rB375c7dc4caf4`
Worked: (optional)
**Addon Information**
Name: Auto Mirror (2, 5, 2)
Author: Lapineige
**Short description of error**
when I try to use auto mirror an error shows up
**Exact steps for others to reproduce the error**
from the default blend file, I check that I am in object mode click auto mirror and get this error:2.82:
```
Traceback (most recent call last):
File "C:\Program Files\Blender Foundation\Blender 2.82\2.82\scripts\addons\mesh_auto_mirror.py", line 167, in execute
threshold= bpy.context.scene.AutoMirror_threshold)
File "C:\Program Files\Blender Foundation\Blender 2.82\2.82\scripts\modules\bpy\ops.py", line 201, in __call__
ret = op_call(self.idname_py(), None, kw)
RuntimeError: Error: Zero normal given
```
2.90:
```
Error: Zero normal given
Traceback (most recent call last):
File "Z:\01_git\01_contribution\blender-git\build_windows_Full_x64_vc15_Debug\bin\Debug\2.90\scripts\addons\mesh_auto_mirror.py", line 178, in execute
threshold = automirror.threshold
File "Z:\01_git\01_contribution\blender-git\build_windows_Full_x64_vc15_Debug\bin\Debug\2.90\scripts\modules\bpy\ops.py", line 201, in __call__
ret = op_call(self.idname_py(), None, kw)
RuntimeError: Error: Zero normal given
```
**Exact steps for others to reproduce the error**
location: <unknown location>:-11. Open Blender with default startup file
2. Deselect the cube
3. Open the sidebar and click on the AutoMirror button (`bpy.ops.object.automirror()`)