Hello,
I am sorry, I missed fixing this in 1.7.2, but the fix is super easy.
I have attached for you here a .unitypackage with the relevant file to fix this. After you import the package and the new file, the editor will no longer crash after re-importing an animation. The cutscene will automatically stop before import takes place instead.
This fix will of course exist in the next version as well.
Thanks for the reminder!
