Why UE crashed after delete a keyframe in the sequencer

I am using multiples levels and most of them are locked. in one of the levels, I have a light that I put in the sequencer and I keyed the intensity. being lock the level I trying to delete one of the keys in the sequencer and UE crash all the time, when unlocking the level where the light is and I delete the key I don’t have any problem. Can someone help me to know why is crashing UE just for that silly thing?

thank you