hard to debug connection failure

[abraxxa]

I'm struggling to debug a Mojo::IOLoop based daemon issue that manifests itself with the follow two warnings and the following exception:

Use of uninitialized value $exp in concatenation (.) or string at /home/nac/.plenv/versions/COLLECTOR-Debian9-Perl5.28.0/lib/perl5/site_perl/5.28.0/Mojo/RabbitMQ/Client.pm line 545.
Use of uninitialized value $expected[0] in join or string at /home/nac/.plenv/versions/COLLECTOR-Debian9-Perl5.28.0/lib/perl5/site_perl/5.28.0/Mojo/RabbitMQ/Client.pm line 549.
Mojo::Reactor::Poll: I/O watcher failed: Mojo::RabbitMQ::Client::Method: Method is not . It's Net::AMQP::Protocol::Channel::OpenOk at /home/nac/.plenv/versions/COLLECTOR-Debian9-Perl5.28.0/lib/perl5/site_perl/5.28.0/Mojo/EventEmitter.pm line 19

Something passes undef as the expected frame(s) to sub _expect. As it only happens once every few weeks I haven't been able to collect DEBUG logs from the module.

Did you encounter this issue before or have a suggestion how to debug it?
Thanks!