Bug Crash in version 46 (NANOWRIMO)

I pasted the following formatted word as my novel title: Tiānmíng. The spell checker seemed to recognize the first three letters. After the “a overbar”, the spell checker indicated a misspelling. Right clicking the misspelled portion and selecting either ‘learn’ or ‘ignore’ crashed version 46. I’m sure it is repeatable but I don’t want to try it again. I also tried resizing the title a few times successively which also crashed the program. The recovered version had the title correctly resized. The common denominator appears to be the “a overbar”. Not sure why the “i acute” was okay.