diff --git a/controllers/class.Login.php b/controllers/class.Login.php
index fbf9ed835..bf5abc190 100644
--- a/controllers/class.Login.php
+++ b/controllers/class.Login.php
@@ -57,6 +57,10 @@ class SeedDMS_Controller_Login extends SeedDMS_Controller_Common {
 		 */
 		if(!$user && $settings->_enableGuestLogin && (int) $settings->_guestID) {
 			$guestUser = $dms->getUser((int) $settings->_guestID);
+			if(!$guestUser) {
+				$this->setErrorMsg("login_error_text");
+				return false;
+			}
 			if(($login != $guestUser->getLogin())) {
 				if ((!isset($pwd) || strlen($pwd)==0)) {
 					$this->setErrorMsg("login_error_text");