diff --git a/apps/user_ldap/appinfo/database.xml b/apps/user_ldap/appinfo/database.xml
index a785bbf4221c0b8c745ea56a2c4e2e8c7b3969cf..812e450dde7a444acd7eb7592743ea64604cc09a 100644
--- a/apps/user_ldap/appinfo/database.xml
+++ b/apps/user_ldap/appinfo/database.xml
@@ -130,7 +130,7 @@
    </field>
 
    <index>
-    <name>ldap_group_members</name>
+    <name>ldap_group_members_index</name>
     <unique>true</unique>
     <field>
      <name>owncloudname</name>
diff --git a/apps/user_ldap/appinfo/update.php b/apps/user_ldap/appinfo/update.php
index f23285a0dc63a744d5ae9776c9c435b66948ed88..e6e25cec73456b9c7ba6336a2f58c14a4ecc00c5 100644
--- a/apps/user_ldap/appinfo/update.php
+++ b/apps/user_ldap/appinfo/update.php
@@ -34,7 +34,7 @@ $groupBE = new \OCA\user_ldap\GROUP_LDAP();
 $groupBE->setConnector($connector);
 
 foreach($objects as $object) {
-	$fetchDNSql = 'SELECT `ldap_dn`, `owncloud_name` FROM `*PREFIX*ldap_'.$object.'_mapping` WHERE `directory_uuid` = ""';
+	$fetchDNSql = 'SELECT `ldap_dn`, `owncloud_name` FROM `*PREFIX*ldap_'.$object.'_mapping` WHERE `directory_uuid` = \'\'';
 	$updateSql = 'UPDATE `*PREFIX*ldap_'.$object.'_mapping` SET `ldap_DN` = ?, `directory_uuid` = ? WHERE `ldap_dn` = ?';
 
 	$query = OCP\DB::prepare($fetchDNSql);