fix error when login token expires

src/App/App.xaml.cs

@@ -97,7 +97,8 @@ namespace Bit.App
                 }
                 else if(message.Command == "logout")
                 {
-                    Device.BeginInvokeOnMainThread(async () => await LogOutAsync(false));
+                    Device.BeginInvokeOnMainThread(async () =>
+                        await LogOutAsync((message.Data as bool?).GetValueOrDefault()));
                 }
                 else if(message.Command == "loggedOut")
                 {
@@ -240,6 +241,10 @@ namespace Bit.App
             _authService.LogOut(() =>
             {
                 Current.MainPage = new HomePage();
+                if(expired)
+                {
+                    _platformUtilsService.ShowToast("warning", null, AppResources.LoginExpired);
+                }
             });
         }
 

src/App/Pages/Vault/AddEditPageViewModel.cs

@@ -456,7 +456,10 @@ namespace Bit.App.Pages
             catch(ApiException e)
             {
                 await _deviceActionService.HideLoadingAsync();
-                await Page.DisplayAlert(AppResources.AnErrorHasOccurred, e.Error.GetSingleMessage(), AppResources.Ok);
+                if(e?.Error != null)
+                {
+                    await Page.DisplayAlert(AppResources.AnErrorHasOccurred, e.Error.GetSingleMessage(), AppResources.Ok);
+                }
             }
             return false;
         }

src/App/Resources/AppResources.Designer.cs

@@ -2274,6 +2274,15 @@ namespace Bit.App.Resources {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Your login session has expired..
+        /// </summary>
+        public static string LoginExpired {
+            get {
+                return ResourceManager.GetString("LoginExpired", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Login.
         /// </summary>

src/App/Resources/AppResources.resx

@@ -1575,4 +1575,7 @@
   <data name="ToggleVisibility" xml:space="preserve">
     <value>Toggle Visibility</value>
   </data>
+  <data name="LoginExpired" xml:space="preserve">
+    <value>Your login session has expired.</value>
+  </data>
 </root>