[mhamdi]

Running fine in 3.6.3.
Just replaced:

$db->connect(
$config['Database']['dbname'],
$config['MasterServer']['servername'],
$config['MasterServer']['username'],
$config['MasterServer']['password'],
$config['MasterServer']['usepconnect'],
$config['SlaveServer']['servername'],
$config['SlaveServer']['username'],
$config['SlaveServer']['password'],
$config['SlaveServer']['usepconnect'],
$config['Mysqli']['ini_file']
);

with

$db->connect(
$config['Database']['dbname'],
$config['MasterServer']['servername'],
$config['MasterServer']['usepconnect'],
$config['MasterServer']['username'],
$config['MasterServer']['password'],
$config['SlaveServer']['servername'],
$config['SlaveServer']['usepconnect'],
$config['SlaveServer']['username'],
$config['SlaveServer']['password'],
$config['Mysqli']['ini_file']
);

Thanks WorkRelated!