It is very likely that the crash is due to a corrupted setting file of ARES. The simplest way to fix it is to simply delete all the setting files and start ARES again.
The settings files should be located here:
You can safely delete all the files and folders in that directory.
Edit (thanks @elliott): in many cases it is sufficient to delete only JobList.h5
I've found that it is often sufficient to just delete the following two files, which allows one to keep their Ares preferences intact:
edit: was wrong filename
Update: in many cases it is sufficient to delete only JobList.h5