QProcess.setStandardOutput(None) causes a core dump

I am using two instances of QProcess

QProcess

 In some portions of my code I need process1 to redirect its output to process2.
By following Qt documentation I can use

QProcess.setStandardOutput()

From the documentation I have copied the code below.

 process1 = QProcess()
 process2 = QProcess()
 process1.setStandardOutputProcess(process2)
 process1.start("command1")
 process2.start("command2")

If I want to change it back to default. Meaning, that I don't want process1 output to go to process2

 process1.setStandardOutput(None) 

It will cause a core dump.  Using the code below will not cause a core dump.

process1.setStandardOutput(QProcess())

Is that normal behavior?