diff --git a/etc/upgrade/4.2.11/content b/etc/upgrade/4.2.11/content
index 8c40d37e8da..5e43db7393a 100644
--- a/etc/upgrade/4.2.11/content
+++ b/etc/upgrade/4.2.11/content
@@ -44,6 +44,7 @@ EOSQL
         $txns->Limit( FIELD => 'Type', VALUE => 'Forward Ticket' );
         while ( my $txn = $txns->Next ) {
             my $att = $txn->Attachments->First;
+            next unless $att;
 
             # we only need to process ascii-only strings
             unless ( $att->Subject =~ /[^\x00-\x7F]/ ) {