# Buggy code
def reset_namespace(self, warning=False, silent=True, message=False):
    """Reset the namespace by removing all names defined by the user."""
    reset_str = _("Remove all variables")
    warn_str = _(
        "All user-defined variables will be removed. Are you sure you want to proceed?"
    )

    if warning:
        box = MessageCheckBox(icon=QMessageBox.Warning, parent=self)
        box.setWindowTitle(reset_str)
        box.set_checkbox_text(_("Don't show again."))
        box.setStandardButtons(QMessageBox.Yes | QMessageBox.No)
        box.setDefaultButton(QMessageBox.Yes)

        box.set_checked(False)
        box.set_check_visible(True)
        box.setText(warn_str)

        answer = box.exec_()

        # Update checkbox based on user interaction
        CONF.set(
            "ipython_console", "show_reset_namespace_warning", not box.is_checked()
        )

        if answer != QMessageBox.Yes:
            return

    if self._reading:
        self.dbg_exec_magic("reset", "-f")
    else:
        if silent:
            if message:
                self.reset()
                self._append_html(
                    _("<br><br>Removing all variables...\n<hr>"), before_prompt=False
                )
            self.silent_execute("%reset -f")
            self.refresh_namespacebrowser()
        else:
            self.execute("%reset -f")

        if not self.external_kernel:
            self.silent_execute("get_ipython().kernel.close_all_mpl_figures()")


# Traceback (AttributeError)
File "d:\miniconda\lib\site-packages\spyder\widgets\ipythonconsole\client.py", line 530, in reset_namespace
message=True)
File "d:\miniconda\lib\site-packages\spyder\widgets\ipythonconsole\shell.py", line 261, in reset_namespace
self.reset()
File "d:\miniconda\lib\site-packages\qtconsole\frontend_widget.py", line 665, in reset
self._show_interpreter_prompt()
File "d:\miniconda\lib\site-packages\qtconsole\jupyter_widget.py", line 348, in _show_interpreter_prompt
msg_id = self.kernel_client.execute('', silent=True)
AttributeError: 'NoneType' object has no attribute 'execute'

# Fixed code
def reset_namespace(self, warning=False, silent=True, message=False):
    """Reset the namespace by removing all names defined by the user."""
    reset_str = _("Remove all variables")
    warn_str = _(
        "All user-defined variables will be removed. Are you sure you want to proceed?"
    )

    if warning:
        box = MessageCheckBox(icon=QMessageBox.Warning, parent=self)
        box.setWindowTitle(reset_str)
        box.set_checkbox_text(_("Don't show again."))
        box.setStandardButtons(QMessageBox.Yes | QMessageBox.No)
        box.setDefaultButton(QMessageBox.Yes)

        box.set_checked(False)
        box.set_check_visible(True)
        box.setText(warn_str)

        answer = box.exec_()

        # Update checkbox based on user interaction
        CONF.set(
            "ipython_console", "show_reset_namespace_warning", not box.is_checked()
        )

        if answer != QMessageBox.Yes:
            return

    try:
        if self._reading:
            self.dbg_exec_magic("reset", "-f")
        else:
            if silent:
                if message:
                    self.reset()
                    self._append_html(
                        _("<br><br>Removing all variables...\n<hr>"),
                        before_prompt=False,
                    )
                self.silent_execute("%reset -f")
                self.refresh_namespacebrowser()
            else:
                self.execute("%reset -f")

            if not self.external_kernel:
                self.silent_execute("get_ipython().kernel.close_all_mpl_figures()")
    except AttributeError:
        pass