Only in work.orig/: Mojolicious-6.12
diff -ru work.orig/Mojolicious-6.15/lib/Mojo/IOLoop.pm work/Mojolicious-6.15/lib/Mojo/IOLoop.pm
--- work.orig/Mojolicious-6.15/lib/Mojo/IOLoop.pm	2015-08-18 16:15:57.000000000 -0400
+++ work/Mojolicious-6.15/lib/Mojo/IOLoop.pm	2015-08-18 16:53:48.000000000 -0400
@@ -168,14 +168,14 @@
 sub _maybe_accepting {
   my $self = shift;
   return if $self->{accepting} || $self->_limit;
-  $_->start for values %{$self->{acceptors} || {}};
+  do { $_->start if $_ } for values %{$self->{acceptors} || {}};
   $self->{accepting} = 1;
 }
 
 sub _not_accepting {
   my $self = shift;
   return $self unless delete $self->{accepting};
-  $_->stop for values %{$self->{acceptors} || {}};
+  do { $_->stop if $_ } for values %{$self->{acceptors} || {}};
   return $self;
 }