error in postfix log after adding muninplugin

[turandon]

I added yesterday a postfix plugin to my munin installation:
https://github.com/munin-monitoring/contrib/blob/master/plugins/postfix/postfix_mailvolume_multi

From this point on I get a error in my postfix log:
postfix/sendmail[17682]: fatal: open /etc///main.cf: No such file or directory

it seems this is the result of the following line:
$dir =~ s/\/etc\///g;

Any hints on how to solve this issue?

[sumpfralle]

Based on the follow-up discussion on the IRC channel, I think we can close this?

[github-actions]

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