diff --git a/api/src/Ldap.php b/api/src/Ldap.php
index abd2f157db..f6c1badf10 100644
--- a/api/src/Ldap.php
+++ b/api/src/Ldap.php
@@ -227,7 +227,7 @@ class Ldap
 			$host = parse_url($host,PHP_URL_HOST);
 		}
 		// connect to ldap server (never fails, as connection happens in bind!)
-		if(!($this->ds = !empty($port) ? ldap_connect($host, $port) : ldap_connect($host)))
+		if(!$host || !($this->ds = !empty($port) ? ldap_connect($host, $port) : ldap_connect($host)))
 		{
 			return False;
 		}