sub label {
my $self = shift;
my $conf = new FS::Conf;
- if ( $conf->config('svc_external-display_type') eq 'artera_turbo' ) {
+ if ( $conf->exists('svc_external-display_type')
+ && $conf->config('svc_external-display_type') eq 'artera_turbo' )
+ {
sprintf('%010d', $self->id). '-'.
substr('0000000000'.uc($self->title), -10);
} else {