updated sample

Author: rdelrosario

samples/GoogleClientSample/GoogleClientSample.Android/GoogleClientSample.Android.csproj

@@ -57,9 +57,6 @@
     <PackageReference Include="PropertyChanged.Fody">
       <Version>2.6.1</Version>
     </PackageReference>
-    <PackageReference Include="Plugin.GoogleClient">
-      <Version>2.0.17-beta</Version>
-    </PackageReference>
     <PackageReference Include="Xamarin.Android.Support.Annotations">
       <Version>28.0.0.3</Version>
     </PackageReference>
@@ -87,6 +84,9 @@
     <PackageReference Include="Xamarin.GooglePlayServices.Basement">
       <Version>71.1620.0</Version>
     </PackageReference>
+    <PackageReference Include="Plugin.GoogleClient">
+      <Version>2.0.18-beta</Version>
+    </PackageReference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="MainActivity.cs" />

samples/GoogleClientSample/GoogleClientSample.iOS/GoogleClientSample.iOS.csproj

@@ -127,9 +127,6 @@
     <PackageReference Include="PropertyChanged.Fody">
       <Version>2.6.1</Version>
     </PackageReference>
-    <PackageReference Include="Plugin.GoogleClient">
-      <Version>2.0.17-beta</Version>
-    </PackageReference>
     <PackageReference Include="Xamarin.Firebase.iOS.Core">
       <Version>6.1.0</Version>
     </PackageReference>
@@ -139,6 +136,9 @@
     <PackageReference Include="Xamarin.Google.iOS.SignIn">
       <Version>5.0.1</Version>
     </PackageReference>
+    <PackageReference Include="Plugin.GoogleClient">
+      <Version>2.0.18-beta</Version>
+    </PackageReference>
   </ItemGroup>
   <ItemGroup>
     <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Contents.json" />

src/Plugin.GoogleClient/GoogleClientManager.apple.cs

@@ -65,7 +65,7 @@ params string[] scopes
         )
         {
             SignIn.SharedInstance.Delegate = CrossGoogleClient.Current as ISignInDelegate;
-            if (scopes.Length > 0)
+            if (scopes != null && scopes.Length > 0)
             {
 
                 var currentScopes = SignIn.SharedInstance.Scopes;
@@ -170,8 +170,7 @@ public async Task<GoogleResponse<GoogleUser>> SilentLoginAsync()
             }
 
             //SignIn.SharedInstance.CurrentUser.Authentication.ClientId != _clientId
-            var task = CreateLoginTask();
-
+            _loginTcs = new TaskCompletionSource<GoogleResponse<GoogleUser>>();
 
             if (SignIn.SharedInstance.HasPreviousSignIn)
                 SignIn.SharedInstance.RestorePreviousSignIn();
@@ -191,8 +190,8 @@ public async Task<GoogleResponse<GoogleUser>> SilentLoginAsync()
                 _onError?.Invoke(this, errorEventArgs);
                 _loginTcs.TrySetException(new GoogleClientBaseException());
             }
-            
-            return await task;
+
+            return await _loginTcs.Task;
         }
 
 		public static bool OnOpenUrl(UIApplication app, NSUrl url, NSDictionary options)
@@ -306,13 +305,6 @@ private void UpdatePresentedViewController()
         }
 
 
-        private static Task<GoogleResponse<GoogleUser>> CreateLoginTask()
-        {
-            _loginTcs = new TaskCompletionSource<GoogleResponse<GoogleUser>>();
-            
-            return _loginTcs.Task;
-        }
-
         private void OnSignInSuccessful(Google.SignIn.GoogleUser user)
         {
             GoogleUser googleUser = new GoogleUser