Use of uninitialized value $domain in concatenation (.) or string at /usr/share/perl5/PMG/Utils.pm line 678.

While editing my main.cf.in file, i then run pmgconfig sync --restart 1 which results in an error:
Use of uninitialized value $domain in concatenation (.) or string at /usr/share/perl5/PMG/Utils.pm line 678.

At first I thought it was related to my custom template, but i erased the template and still got the same error.
Any suggestions on how to fix this?

Thanks!