I have a Mac Pro and an Mac Air both on 10.12.3 and using FMPA 126.96.36.1995. Neither of them crash on quitting.
First, remove all plugins and try quitting to see if one of them may be the problem. If so, you may need to upgrade one of them or stop using it.
Can you log in as another user on the same computer and open and quick FileMaker without this problem? If so, it is a problem with user preferences in your library somewhere.
You can always reinstall FileMaker and see if that helps.
Let us know what you find out.
Your crash log and the circumstances bear resemblances to observations in this report (scroll down for the crash log):