/**
	 * Checks if there is a lock record
	 * @return bool
	 */
	private function isLocked()
	{
		if($this->locked != 1) return false;

		if($this->tstamp != 0)
		{
			jimport('joomla.utilities.date');
			$date = new JDate();
			$now = $date->toUNIX();

			$diff = abs( $now - $this->tstamp );
			if($diff > 180)
			{
				$this->isCrashed = true;
			}
		}
		return true;
	}