UE4.12 crashes with japanese

I also just tried and I did get the same error. I am using google Japanese IME.

However, I only got the error when I wrote いち and then hit spacebar to change it into 1。

http://puu.sh/q7CJi/9be5c6834d.png

This is the code that causes the crash.

The actor is a BP actor with a sphere component attached to a cube component attached to the default scene root. If I bind the action to a key it only crashes when I hit that key.

I hope this helps.

EDIT:
I just tried converting [1  1] into the coded representations commonly used by using [this tool][2]. There might be a hint here.