diff --git a/apps/user_ldap/lib/helper.php b/apps/user_ldap/lib/helper.php
index 03a65a65b1c3ad871cb4d47e19233c64353b4200..263d95f898f112c8ee7b142ee6aca100ecf749d6 100644
--- a/apps/user_ldap/lib/helper.php
+++ b/apps/user_ldap/lib/helper.php
@@ -81,7 +81,8 @@ class Helper {
 			DELETE
 			FROM `*PREFIX*appconfig`
 			WHERE `configkey` LIKE ?
-				AND appid = "user_ldap"
+				AND `appid` = "user_ldap"
+				AND `configkey` NOT IN ("enabled", "installed_version", "types", "bgjUpdateGroupsLastRun")
 		');
 		$res = $query->execute(array($prefix.'%'));