protected static function nullMethod($column, $filter, $query, $or = false)
	{
		if ($filter === 'NULL') {
			$method = self::determineMethod('whereNull', $or);
			$query->$method($column);
		} else {
			$method = self::determineMethod('whereNotNull', $or);
			$query->$method($column);
		}
	}