diff --git a/apps/contacts/import.php b/apps/contacts/import.php
index 0ee35f9fd81f094e54fa94950f98cba648e7deee..c95fd970fe1018621ba61c4087cf83cda21ccdc3 100644
--- a/apps/contacts/import.php
+++ b/apps/contacts/import.php
@@ -15,7 +15,7 @@ session_write_close();
 $nl = "\n";
 
 global $progresskey;
-$progresskey = 'contacts.import-' . $_GET['progresskey'];
+$progresskey = 'contacts.import-' . (isset($_GET['progresskey'])?$_GET['progresskey']:'');
 
 if (isset($_GET['progress']) && $_GET['progress']) {
 	echo OC_Cache::get($progresskey);