diff --git a/covas_mobile/lib/main.dart b/covas_mobile/lib/main.dart
index 80d6854..c9ddb2c 100644
--- a/covas_mobile/lib/main.dart
+++ b/covas_mobile/lib/main.dart
@@ -54,12 +54,12 @@ class _LoginDemoState extends State<LoginDemo> with ShowErrorDialog {
               switch (cookie2.split("=")[0]) {
                 case "jwt":
                   {
-                    prefs.setString("jwt", cookie2);
+                    prefs.setString("jwt", cookie2.toString());
                   }
                   break;
                 case "user":
                   {
-                    prefs.setString("user", cookie2);
+                    prefs.setString("user", cookie2.toString());
                   }
                   break;
                 default: