diff --git a/installer/data/mysql/updatedatabase.pl b/installer/data/mysql/updatedatabase.pl
index 153690406e..0062bf517f 100755
--- a/installer/data/mysql/updatedatabase.pl
+++ b/installer/data/mysql/updatedatabase.pl
@@ -12580,6 +12580,9 @@ SetVersion($DBversion);
 
 $DBversion = "3.23.00.063";
 if ( CheckVersion($DBversion) ) {
+    $dbh->do(q{
+        UPDATE letter SET branchcode='' WHERE branchcode IS NULL;
+    });
     $dbh->do(q{
         ALTER TABLE letter MODIFY COLUMN branchcode varchar(10) NOT NULL DEFAULT ''
     });