# Buggy code
def qt_args(namespace: argparse.Namespace) -> List[str]:
    """Get the Qt QApplication arguments based on an argparse namespace.

    Args:
        namespace: The argparse namespace.

    Return:
        The argv list to be passed to Qt.
    """
    argv = [sys.argv[0]]

    if namespace.qt_flag is not None:
        argv += ["--" + flag[0] for flag in namespace.qt_flag]

    if namespace.qt_arg is not None:
        for name, value in namespace.qt_arg:
            argv += ["--" + name, value]

    argv += ["--" + arg for arg in config.val.qt.args]

    if objects.backend != usertypes.Backend.QtWebEngine:
        assert objects.backend == usertypes.Backend.QtWebKit, objects.backend
        return argv

    special_prefixes = (_ENABLE_FEATURES, _DISABLE_FEATURES, _BLINK_SETTINGS)
    special_flags = [flag for flag in argv if flag.startswith(special_prefixes)]
    argv = [flag for flag in argv if not flag.startswith(special_prefixes)]
    argv += list(_qtwebengine_args(namespace, special_flags))

    return argv


# Traceback (AssertionError)
Traceback (most recent call last):
File "/usr/lib/python3.9/runpy.py", line 197, in _run_module_as_main
return _run_code(code, main_globals, None,
File "/usr/lib/python3.9/runpy.py", line 87, in _run_code
exec(code, run_globals)
File "/home/florian/proj/qutebrowser/git/qutebrowser/__main__.py", line 29, in <module>
sys.exit(qutebrowser.qutebrowser.main())
File "/home/florian/proj/qutebrowser/git/qutebrowser/qutebrowser.py", line 217, in main
return app.run(args)
File "/home/florian/proj/qutebrowser/git/qutebrowser/app.py", line 95, in run
app = Application(args)
File "/home/florian/proj/qutebrowser/git/qutebrowser/app.py", line 554, in __init__
qt_args = qtargs.qt_args(args)
File "/home/florian/proj/qutebrowser/git/qutebrowser/config/qtargs.py", line 64, in qt_args
argv += list(_qtwebengine_args(namespace, special_flags))
File "/home/florian/proj/qutebrowser/git/qutebrowser/config/qtargs.py", line 151, in _qtwebengine_args
versions = version.qtwebengine_versions(avoid_init=True)
File "/home/florian/proj/qutebrowser/git/qutebrowser/utils/version.py", line 609, in qtwebengine_versions
assert webenginesettings is not None
AssertionError

# Fixed code
def qt_args(namespace: argparse.Namespace) -> List[str]:
    """Get the Qt QApplication arguments based on an argparse namespace.

    Args:
        namespace: The argparse namespace.

    Return:
        The argv list to be passed to Qt.
    """
    argv = [sys.argv[0]]

    if namespace.qt_flag is not None:
        argv += ["--" + flag[0] for flag in namespace.qt_flag]

    if namespace.qt_arg is not None:
        for name, value in namespace.qt_arg:
            argv += ["--" + name, value]

    argv += ["--" + arg for arg in config.val.qt.args]

    if objects.backend != usertypes.Backend.QtWebEngine:
        assert objects.backend == usertypes.Backend.QtWebKit, objects.backend
        return argv

    try:
        from qutebrowser.browser.webengine import webenginesettings
    except ImportError:
        # This code runs before a QApplication is available, so before
        # backendproblem.py is run to actually inform the user of the missing
        # backend. Thus, we could end up in a situation where we're here, but
        # QtWebEngine isn't actually available.
        # We shouldn't call _qtwebengine_args() in this case as it relies on
        # QtWebEngine actually being importable, e.g. in
        # version.qtwebengine_versions().
        log.init.debug("QtWebEngine requested, but unavailable...")
        return argv

    special_prefixes = (_ENABLE_FEATURES, _DISABLE_FEATURES, _BLINK_SETTINGS)
    special_flags = [flag for flag in argv if flag.startswith(special_prefixes)]
    argv = [flag for flag in argv if not flag.startswith(special_prefixes)]
    argv += list(_qtwebengine_args(namespace, special_flags))

    return argv