I noticed a bug while moving adjustments I did in a child class to the parent. If you add a component with name similar to a component added to a child class, it crashes. You probably need something to stop the user from trying to use the same name as it clearly conflicts with the component in the child.
Hope this helps.
Epic can always use more info like this, but it really belongs on the UE4 Answer Hub.
From the looks of things, other people have reported a similar issue.
From your description, I’m not sure if this is already a known crash or not. As Kris suggested, can you please follow this How To Report a Bug guide for the correct process?