Bug when calculating average windrose with ladybug

Hello community! When I tried to get average windrose per month with ladybug 1.5, it reported an error “attempt tp divide by zero”. I saw someone managed to do it with LB 1.4. I wonder if there is another way to get the average windrose per month?

It seems to be the problem with “Shenzhen” epw file. These batteries work with other cities except Shenzhen.

Can you upload a sample file that recreates the issue? Maybe we can use it to find out what exactly about the Shenzhen weather file is causing the error and give a better error message from the component.