diff --git a/addressbook/inc/class.addressbook_ldap.inc.php b/addressbook/inc/class.addressbook_ldap.inc.php
index 0a60106efb..acfcc9bc04 100644
--- a/addressbook/inc/class.addressbook_ldap.inc.php
+++ b/addressbook/inc/class.addressbook_ldap.inc.php
@@ -317,7 +317,7 @@ class addressbook_ldap
 	function connect($admin = false)
 	{
 		// if egw object does not yet exists (eg. in sharing), we have to use our own ldap instance!
-		$ldap = isset($GLOBALS['egw']) ? $GLOBALS['egw']->ldap : new ldap();
+		$ldap = isset($GLOBALS['egw']) && is_a($GLOBALS['egw']->ldap, 'ldap') ? $GLOBALS['egw']->ldap : new ldap();
 
 		if ($admin)
 		{