diff --git a/js/controller/BoardController.js b/js/controller/BoardController.js
index 062c05ca1..01990f108 100644
--- a/js/controller/BoardController.js
+++ b/js/controller/BoardController.js
@@ -215,6 +215,9 @@ app.controller('BoardController', function ($rootScope, $scope, $stateParams, St
 	};
 
 	$scope.aclTypeString = function (acl) {
+		if (typeof acl === 'undefined') {
+			return '';
+		}
 		switch (acl.type) {
 			case OC.Share.SHARE_TYPE_USER:
 				return 'user';