Blender Version
Broken: 2.91
Short description of error
Blender crashes when using the symmetrize operator on an armature with an invalid action constraint
Exact steps for others to reproduce the error
- Create an armature
- Rename the bone as "Bone.L"
- Add an action constraint to the bone (leave the "target" field empty)
- Go back to edit mode and use the symmetrize operator on the bone