verifyIdToken works one time and fails another time - php

Question

I'm trying to implement google sign-in to on my website.
I've done the steps from here Authenticate with Google.
This function executes after i have logged in to google :
function onSignIn(googleUser) {
var googleResponse = googleUser.getAuthResponse();
google_login(googleResponse, true);
};
Google_login function:
function google_login(res) {
var httpObject = getXMLHTTPObject();
var ajax_url = siteURL + 'google_login';
var params = 'token='+encodeURIComponent(res.id_token);
httpObject.open('POST', ajax_url, true);
httpObject.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
httpObject.onreadystatechange = function() {
if (httpObject.readyState == 4) {
if(httpObject.responseText == 'true') {
window.location = httpObject.responseURL;
}
else {
if(httpObject.responseText == '') {
window.location = siteURL + 'login_again';
}
else {
window.location = siteURL + 'google_login_error';
}
}
}
};
httpObject.send(params);
}
And in my model I'm using this code:
private $google_client;
function Google_model() {
parent::__construct();
$this->google_client = new Google_Client(['client_id' => 'my_client_id','client_secret' =>'my_client_secret']);
}
function check_google_user($access_token) {
$payload = $this->google_client->verifyIdToken($access_token);
if ($payload) {
return $payload;
}
return false;
}
In my controller I'm calling check_google_user function.
And here appears a strange behaviour. Sometimes when I try to login I get the payload, and sometimes not (PS: I'm trying to login with the same user in the same day). Am I doing something wrong?
EDIT:
I'm getting this error: Caught exception: Cannot handle token prior to 2017-01-25T16:20:24+0200

Answer 1

Solved this by commenting these lines in firebase JWT.php file:
throw new BeforeValidException(
'Cannot handle token prior to ' . date(DateTime::ISO8601, $payload->iat)
);