/ by zero error at coreg_ifg_topsar.py step

When I doing cor_ifg_topsar.py project.conf, Error: / by zero happen like picture.
Why this problem happen and how can I solve it??

Your image cuts off important details, such as the routine where the division by zero occurred. Ideally, you should provide enough detail to allow others to reproduce the problem. It is helpful if you can create a minimal example so it is easier for people trying to reproduce the error. You should make sure your software is fully updated in case the issue has already been fixed and also so anyone trying to reproduce the issue can easily replicate your software configuration.