Dear Maintainer, After running into segfaulting nagioses last Friday, I found that this was caused by a combination "check_for_updates=1" in the default Debian /etc/nagios4/nagios.cfg, and a faulty API response: https://github.com/NagiosEnterprises/nagioscore/issues/1041 I believe this parameter should be set to 0 in the default Debian config, as it would prevent nagios from phoning home and submitting information. But it would also prevent nagios from crashing on bugs in the code that handles the phoning home.