[PyQt] App crashes when reopening a subwindow

[JokerSob]

        self.mdiArea = QtWidgets.QMdiArea()
        self.mdiArea.setGeometry(0, 0, 600, 400)
        self.mdiArea.setAutoFillBackground(True)
        self.mdiArea.setObjectName("mdiArea")
  
        self.subWindowUsers = QtWidgets.QWidget()
        self.subWindowUsers.setMinimumSize(QtCore.QSize(466, 267))
        self.subWindowUsers.setObjectName("subWindowUsers")

    def OpenUserForm(self, text):
        self.mdiArea.addSubWindow(ui.subWindowUsers)
        ui.subWindowUsers.setWindowTitle(text)
        ui.subWindowUsers.show()

What does it give as an error?

where is the " self "... I guess it might be because you didn't specify this on the bottom line on the side I cut out... I didn't have a chance to test your code, I'm just making a guess.