Just confirming that I have been able to reproduce the crash also.
I would expect an error message instead perhaps.
Thank you for your post.
I am also able to replicate the problem on Windows XP, Mac OS X 10.5.8 and Mac OS X 10.6.2. I have forwarded your post along with my findings to our Development and Software Quality Assurance (Testing) departments for review and confirmation.
This bug does not occur in FileMaker 12 on Windows XP.