QT signal slot alarm QObject:: connect:cannot connect (null)

It is very simple to bind a signal and slot connection in the constructor ,m_pTimer Is a pointer member variable ,
Compiler error ：QObject：：connnect:Cannot connect(null);
It took Baidu a long time to find the original pointer m_pTimer Not initialized 0.0 Obviously low An oversight of , ha-ha
connect(m_pTimer, SIGNAL(timeout()), this, SLOT(setStop()));