don't throw 'Use of uninitialized value in addition (+) at /usr/local/share/perl/5.8.8/FS/cust_svc.pm line 626.' error when using attribute_since_sqlradacct

1 files changed, 2 insertions, 1 deletions

diff --git a/FS/FS/cust_svc.pm b/FS/FS/cust_svc.pm
index 30b23908c..320f78aa0 100644
--- a/FS/FS/cust_svc.pm
+++ b/FS/FS/cust_svc.pm
@@ -629,7 +629,8 @@ sub attribute_since_sqlradacct {
     ) or die $dbh->errstr;
     $sth->execute($username, $start, $end) or die $sth->errstr;
 
-    $sum += $sth->fetchrow_arrayref->[0];
+    my $row = $sth->fetchrow_arrayref;
+    $sum += $row->[0] if defined($row->[0]);
 
     warn "$mes done SUMing sessions\n"
       if $DEBUG;