diff --git a/plugins/libkolab/lib/kolab_storage_cache.php b/plugins/libkolab/lib/kolab_storage_cache.php
index 75728d1b..d56f04d5 100644
--- a/plugins/libkolab/lib/kolab_storage_cache.php
+++ b/plugins/libkolab/lib/kolab_storage_cache.php
@@ -491,7 +491,7 @@ class kolab_storage_cache
                 else if ($fetchall && ($object = $this->_unserialize($sql_arr))) {
                     $result[] = $object;
                 }
-                else {
+                else if (!$fetchall) {
                     // only add msguid to dataset index
                     $result[] = $sql_arr;
                 }