Issue with FBInstant.startGameAsync()

[Lawbirth]

Hi,
in some devices (Galaxy S8 and Galaxy S5 Neo, as far as I could see), not always this metod seems to resolve.
I have an Invite function in my Unity Game, but when I try to use Choose Async, it catch an error about "game not started".
So I tried the following:
 

    console.log("Starting Game");
FBInstant.startGameAsync().then(function () {
    console.log("Started Game");
}).catch(function(error) {
  console.error(error);
});

In the rare cases where invite works, also I get the "Started Game" log.
But when it does not work, I can't get neither the log nor the error.

Is there something wrong?

Thank you.

[Noel]

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