From looking at the log, the crash could be coming from something to do with one of your blueprints. The last thing listed before the log cuts off is the following:
[2016.11.01-18.27.11:116][ 1]LogScript:Warning: Script call stack:
Which mentions that the last thing to occur was the ModifyBone function and likely led to the crash. It seems that it may be referring to something that is actually a null reference.
Unfortunately, I can’t get much from the minidump file without the source. When the crash occurs, do you get a crash report window of any sort? If so, could you copy/paste all of the details from it into a comment? If you see a message that says “You do not have the debug symbols needed to display this crash”, you can submit the crash and give me the Machine ID from the crash reporter window instead and I should be able to view the crash in our database.