Nagios Core is crashing / starting with errror exitcode when starting the site

[Exellent1988]

Hy @jiuka, first of all thanks for this template. I'm trying to build a snmp plugin for a different kind of PDu ( and im using your plugins as example.
So far so good. But i struggle with the dev container. whenever i start the site the Nagios part is kinda starting with an error.

Starting mkeventd...OK
Starting rrdcached...OK
Starting npcd...OK
Starting nagios.............ERROR
Starting apache...OK
Starting redis...OK
Initializing Crontab...OK

but it works.
as long as i don't change anything on the site. ( also the nagios.log seems fine)
as soon as i add a host ( or try to change anything else and i want to apply those changes the nagios core crashes and i lose the connection to the site. and i have to restart the nagios core in the cli and remove the .lock file first.
So somethings really odd here and i can't get my hear around it wehre to look, or where to start investigating. :/

Maybe you have an Idea
nagios.log