avoid warning noise

diff --git a/FS/FS/svc_phone.pm b/FS/FS/svc_phone.pm
index 65a98d2..77b0137 100644 (file)
--- a/FS/FS/svc_phone.pm
+++ b/FS/FS/svc_phone.pm
@@ -527,7 +527,7 @@ sub check {
 
   unless ( length($self->pin) ) {
     my $random_pin = $conf->config('svc_phone-random_pin');
-    if ( $random_pin =~ /^\d+$/ ) {
+    if ( defined($random_pin) && $random_pin =~ /^\d+$/ ) {
       $self->pin(
         join('', map int(rand(10)), 0..($random_pin-1))
       );