QUdpSocket::setProxy crash with SOCKS5

QNetworkProxy proxy;
proxy.setHostName("192.168.100.101");
proxy.setPort(1080);
proxy.setType(QNetworkProxy::Socks5Proxy);
proxy.setUser("");
proxy.setPassword("");
 
this->udpsocket->setProxy(proxy);
QHostAddress abc("192.168.100.100");
qDebug() << "socket bind result:" << this->udpsocket->bind(abc,3321);

 $QTDIR\src\network\socket\qsocks5socketengine.cpp  row number 925:
connectData->readBuffer.clear();