if (
$method
&& !$method->is_stub
&& !$method->isa('Class::MOP::Method::Accessor')
&& ( !$self->definition_context
|| $method->package_name eq $self->definition_context->{package} )
) {
should look like:
if (
$method
&& !$method->is_stub
&& !$method->isa('Class::MOP::Method::Accessor')
&& ( !$self->definition_context
|| exists(self->definition_context->{package}) && $method->package_name eq $self->definition_context->{package} )
) {