In Preferences > Addons, if you just deactivate "Action Recorder" (not "Remove"), you should see this message:
Traceback (most recent call last):
File "E:\blender_portable\2.91\scripts\modules\addon_utils.py", line 434, in disable
mod.unregister()
File "C:\Users\Sebastien\AppData\Roaming\Blender Foundation\Blender\2.91\scripts\addons\ActionRecorder-master\__init__.py", line 27, in unregister
bpy.utils.unregister_class(cls)
RuntimeError: unregister_class(...):, missing bl_rna attribute from 'RNAMeta' instance (may not be registered)
Blender version: 2.91 Add-on version: 3.5.6
In Preferences > Addons, if you just deactivate "Action Recorder" (not "Remove"), you should see this message: