diff --git a/mozilla/webtools/testopia/Bugzilla/Testopia/TestCase.pm b/mozilla/webtools/testopia/Bugzilla/Testopia/TestCase.pm
index ca3657a56b1..06ce3e8a240 100644
--- a/mozilla/webtools/testopia/Bugzilla/Testopia/TestCase.pm
+++ b/mozilla/webtools/testopia/Bugzilla/Testopia/TestCase.pm
@@ -823,7 +823,7 @@ sub attach_bug {
     my $self = shift;
     my ($bugids, $caserun_id) = @_;
     my $dbh = Bugzilla->dbh;
-    trick_taint($caserun_id);
+    trick_taint($caserun_id) if $caserun_id;
     
     $bugids = $self->_check_bugs($bugids, "ATTACH");