> > /usr/bin/vux:784: bad math expression: operator expected at `h'
> 
> I can't give an opinion, "bad math expression" is too generic an error.

I don't appear to have the same version, but I get the same error on
line 788, which is

minimum_age=$(( minimum_age * age_format ))

Looks like there are some if/thens which are not being executed which
would change $minimum_age from "1h" to its equivalent in seconds.

Said version attached for your edification.