PHP - Pdo Returning Single String Not Associative Array.

Hi guys,
I am using this oAuth library https://github.com/elbunce/oauth2-php
But more specifically these lines of code:

protected function getToken($token, $isRefresh = true) {
try {
$tableName = $isRefresh ? self::TABLE_REFRESH : self::TABLE_TOKENS;
$tokenName = $isRefresh ? 'refresh_token' : 'oauth_token';

$sql = "SELECT $tokenName, client_id, expires, scope, user_id FROM $tableName WHERE token = :token";
$stmt = $this->db->prepare($sql);
$stmt->bindParam(':token', $token, PDO::PARAM_STR);
$stmt->execute();

$result = $stmt->fetch(PDO::FETCH_ASSOC);

return $result !== FALSE ? $result : NULL;
} catch (PDOException $e) {
$this->handleException($e);
}
}


However, this is retuning no value.
If I modify the code to be:

protected function getToken($token, $isRefresh = true) {
return $token;
}

It returns the $token value, so the $token is definitely being passed to the function.

The code should return an associative array: i.e., $token["expires"], $token["client_id"], $token["userd_id"], $token["scope"], etc
Also $token should not === NULL.

PS. I run a few checks on

$tableName = $isRefresh ? self::TABLE_REFRESH : self::TABLE_TOKENS;
$tokenName = $isRefresh ? 'refresh_token' : 'oauth_token';

And they are returning the correct values.

Which from my thinking narrows it down to:

$sql = "SELECT $tokenName, client_id, expires, scope, user_id FROM $tableName WHERE token = :token";
$stmt = $this->db->prepare($sql);
$stmt->bindParam(':token', $token, PDO::PARAM_STR);
$stmt->execute();

$result = $stmt->fetch(PDO::FETCH_ASSOC);

return $result !== FALSE ? $result : NULL;


Any and all help is greatly appreciated.

Thanks in advance.