I found the following issue when passing the return value of a method that should return a widget returned None instead to QLayout.addWidget().

For the following code example, all calls to addWidget result in a TypeError, except the one with None. This one causes a segmentation fault. My expectation would be that it raises a TypeError as well.

from PySide6.QtWidgets import QApplication, QHBoxLayout

app = QApplication()
layout = QHBoxLayout()

try:
    layout.addWidget(1)
except TypeError:
    pass

try:
    layout.addWidget("foo")
except TypeError:
    pass

try:
    layout.addWidget(None)
except TypeError:
    pass

app.quit()