In L2VipManagerInstance, Replace this:
    private static void addVips(L2PcInstance activeChar)
    {
        String text;
        L2Object object = activeChar.getTarget();
        L2PcInstance target = (L2PcInstance) object;

With this:
    private static void addVips(L2PcInstance activeChar)
    {
        String text;
        L2Object object = activeChar.getTarget();
        if (!(object instanceof L2PcInstance))
                return;
        L2PcInstance target = (L2PcInstance) object;