I was able to reproduce the crash in 4.7.6, but apparently our engineers beat us to it. They have removed the ability to create AnimSequences with 0 frames in our Main Branch of UE4 (4.8 will eventually branch off of Main). In the future you’ll have to create animations from Persona (not the Content Browser) and they all have 1 frame.
Thank you for reporting this though. Please don’t hesitate to report any other bugs that you run into!!