L2PcInstance partner = player.getActiveRequester();
if (partner == null || L2World.getInstance().findObject(partner.getObjectId()) == null)
{
// Trade partner not found, cancel trade
player.sendPacket(new SendTradeDone(0));
player.sendPacket(new SystemMessage(SystemMessageId.TARGET_IS_NOT_FOUND_IN_THE_GAME));
player.setActiveRequester(null);
return;
}