Not sure if anyone else is getting this same bug, but it has happened to me a few times now so I don’t think its a random occurrence.
When editing a blueprint with some variables in it (like a float value variable for example) I have noticed that if you click the variable from the list, edit the value and leave the value highlighted and immediately press ALT+P to play your new changes, the editor will crash. In order to avoid, you need to un-highlight the variables value (for me I just click anywhere inside the blueprint), then click the compile button, then ALT+P. I haven’t tried to replicate this by just clicking the PLAY button in the editor, only the keystroke.
Again, not sure if this is a local problem, or if others have had the same issue.