Code:

$data   = [
  'name'            => $_GET['name'],
  'fax'             => NULL,
  'updated_on'      => date('Y-m-d H:i:s'),
];
$db->update('restaurant', $data, ['id', '=', 12]);

Error:
Fatal error: Uncaught TypeError: Argument 1 passed to ezsql\Database\ez_pdo::escape() must be of the type string, null given, called in /var/www/vendor/ezsql/ezsql/lib/ezQuery.php on line 633 and defined in /var/www/vendor/ezsql/ezsql/lib/Database/ez_pdo.php:173 Stack trace: #0 /var/www/vendor/ezsql/ezsql/lib/ezQuery.php(633): ezsql\Database\ez_pdo->escape(NULL) #1 /var/www/ajax.php(478): ezsql\ezQuery->update('restaurant', Array, Array) #2 {main} thrown in /var/www/vendor/ezsql/ezsql/lib/Database/ez_pdo.php on line 173