When a breakpoint is hit in a BT Task, if you attempt to use CTRL+P to search for and open the BT the task is being run in, try to resume execution, and then return to the original BT Task Blueprint and Pause and Resume execution there, it will cause the editor to crash.
Found in 4.17.2 CL# 3658906
Reproduced in 4.16.3 CL# 3561208 & 4.18 Preview 3 CL# 3676890
Result: Editor crashes
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-50877 in the post.