While trying to deploy an application I've just encountered this error: error @2015-09-24 09:06:31> Route exception: Undef did not pass type constraint "Str" (in $args->{"name"}) at (eval 663) line 192 "Str" is a subtype of "Value" "Value" is a subtype of "Defined" Undef did not pass type constraint "Defined" (in $args->{"name"}) "Defined" is defined as: (defined($_)) in /home/user/perl5.22.0/lib/site_perl/5.22.0/Dancer2/Core/App.pm l. 1276 I don't see this on my development machine and so far I have no idea where to look. Before I go down the rabbit hole trying to find the differences and the source of the problem, I wonder if anyone has encountered this. Dancer2 0.162 on both machines: dev using plackup 1.0037 prod using Starman 0.4014 Dancer2::Plugin::Auth::Extensible 0.401 regards Gabor