NullReferenceException at GoogleClient.OnSignInFailed on Android

[luccasclezar]

Sometimes OnSignInFailed throws a NullReferenceException.

Fatal Exception: NullReferenceException:  Object reference not set to an instance of an object.
       at GoogleClient.OnSignInFailed (ApiException apiException) [0x00398] in <475a18f0ab504c00b219a3927ea4557b>:0(GoogleClient.cs)
       at Plugin.GoogleClient.OnComplete (Task task) [0x000b7] in <475a18f0ab504c00b219a3927ea4557b>:0(GoogleClient.cs)

My guess is that for some reason, this line:

GoogleClientPlugin/src/Plugin.GoogleClient/GoogleClientManager.android.cs

Line 335 in 6d5854f

OnSignInFailed(task.Exception.JavaCast<ApiException>());

Fails to cast the native exception to an ApiException, throwing a NullReferenceException when OnSignInFailed tries to get the StatusCode.

Probably a null check would fix it, but I can't even try/catch this because the exception is inside a callback.