Traceback (most recent call last):
File /home/gdquest/.config/blender/2.80/scripts/addons/power-sequencer/operators/fade_add.py, line 78, in execute
self.fade_animation_clear(context, sequence)
File /home/gdquest/.config/blender/2.80/scripts/addons/power-sequencer/operators/fade_add.py, line 140, in fade_animation_clear
self.fade_fcurve.keyframe_points.remove(keyframe)
RuntimeError: Error: Keyframe not in F-Curve