Hi Mortusnyte,
I tested this in 4.7.2 and got a compile error, but I did not crash. I created a new function in a new Actor Blueprint, and gave it a local variable NewLocalVar_0. I then gave function an output with same name, NewLocalVar_0, and plugged local variable into output in return node. This doesn’t compile (which I may need to enter a bug report for in itself), but it didn’t crash.
Are you using a different version of engine? Can you and attach project log after this crash occurs? Thanks!