diff --git a/Makefile b/Makefile
index 29b9b64..3598a11 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ package_name=$(app_name)
 cert_dir=$(HOME)/.nextcloud/certificates
 github_account=nextcloud
 branch=master
-version+=0.6.1
+version+=0.6.3
 
 
 # Cleaning
diff --git a/appinfo/info.xml b/appinfo/info.xml
index c1525ee..496a41e 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -5,7 +5,7 @@
 	<name>External user support</name>
 	<summary>Use external user authentication methods like IMAP, SMB, FTP, WebDAV, HTTP BasicAuth and XMPP</summary>
 	<description>Use external user authentication methods like IMAP, SMB, FTP, WebDAV, HTTP BasicAuth and XMPP</description>
-	<version>0.6.2</version>
+	<version>0.6.3</version>
 	<licence>agpl</licence>
 	<author>Robin Appelman</author>
 	<types>
diff --git a/lib/base.php b/lib/base.php
index e3d527c..cca1ddb 100644
--- a/lib/base.php
+++ b/lib/base.php
@@ -174,7 +174,7 @@ public function setDisplayName($uid, $displayName) {
 	 *
 	 * @return void
 	 */
-	protected function storeUser($uid, $groups) {
+	protected function storeUser($uid, $groups = []) {
 		if (!$this->userExists($uid)) {
 			$query = \OC::$server->getDatabaseConnection()->getQueryBuilder();
 			$query->insert('users_external')