Kegbot server page shows as "ZeroDivisionError"


When i open my server page I am seeing a “ZeroDivisionError”, not sure what this means, my whole page looks like a bunch of code, it was working fine earlier. Issue seems to have come up when trying to add a new keg.

The below line has been highlighted as the issue in the error message.

36 {% progress_bar keg.percent_full %}

Can anyone let me know how to correct this? I am on digital ocean