Blender 2.90.1 crashed

Hey i need some help.
i just updated to blender 2.90.1
whenever i tried to delete bones and then change into pose mode, it suddenly crashed.
i’ve tried several times, but it keeps crashing. how to report this?
thanks

Please help me, it keeps crushing whenever i tried to choose pose mode :face_with_thermometer: :face_with_thermometer: