diff --git a/core/js/share.js b/core/js/share.js
index 4c8fd87410..71e6136bf7 100644
--- a/core/js/share.js
+++ b/core/js/share.js
@@ -122,7 +122,12 @@ OC.Share={
 					callback(result.data);
 				}
 			} else {
-				OC.dialogs.alert(result.data.message, t('core', 'Error while sharing'));
+				if (result.data && result.data.message) {
+					var msg = result.data.message;
+				} else {
+					var msg = t('core', 'Error');
+				}
+				OC.dialogs.alert(msg, t('core', 'Error while sharing'));
 			}
 		});
 	},