QModbusRtuSerialMaster Q_ASSERT_X "processQueue", "response timer active"

I use QModbusRtuSerialMaster to open a serial port without modbus client

(baudrate:115200 , databits: 8 , parity:noparity , stopbits:1 ,timesOfRetry:3 , response time out: 1000ms).

I  send message continuously .Of course all are time out .But after a while, the program crashes. It seems due to

"  Q_ASSERT_X  m_responseTimer , "processQueue", "response timer active" , processQueue() in QModbusRtuSerialMasterPrivate_p.h

 Maybe  when m_responseTimer starts，  writeAdu in processQueue() executes (due to  last time out )  so m_sendTimer start again and  result in  Q_ASSERT_X  in processQueue().