# Buggy code
def _open_editor_cb(self, elem):
    """Open editor after the focus elem was found in open_editor."""
    if elem is None:
        message.error("No element focused!")
        return
    if not elem.is_editable(strict=True):
        message.error("Focused element is not editable!")
        return

    text = elem.value()
    if text is None:
        message.error("Could not get text from the focused element.")
        return
    assert isinstance(text, str), text

    caret_position = elem.caret_position()

    ed = editor.ExternalEditor(watch=True, parent=self._tabbed_browser)
    ed.file_updated.connect(functools.partial(self.on_file_updated, elem))
    ed.editing_finished.connect(
        lambda: mainwindow.raise_window(objreg.last_focused_window(), alert=False)
    )
    ed.edit(text, caret_position)


# Traceback (ValueError)
16:39:44 DEBUG    init       app:_init_modules:468 Initializing websettings...
16:39:45 ERROR    misc       crashsignal:exception_hook:216 Uncaught exception
Traceback (most recent call last):
File "/bin/qutebrowser", line 11, in <module>
load_entry_point('qutebrowser==1.1.1', 'gui_scripts', 'qutebrowser')()
File "/usr/lib/python3.6/site-packages/qutebrowser/qutebrowser.py", line 188, in main
return app.run(args)
File "/usr/lib/python3.6/site-packages/qutebrowser/app.py", line 137, in run
init(args, crash_handler)
File "/usr/lib/python3.6/site-packages/qutebrowser/app.py", line 163, in init
_init_modules(args, crash_handler)
File "/usr/lib/python3.6/site-packages/qutebrowser/app.py", line 469, in _init_modules
websettings.init(args)
File "/usr/lib/python3.6/site-packages/qutebrowser/config/websettings.py", line 215, in init
webenginesettings.init(args)
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/webenginesettings.py", line 297, in init
websettings.init_mappings(MAPPINGS)
File "/usr/lib/python3.6/site-packages/qutebrowser/config/websettings.py", line 198, in init_mappings
mapping.set(value)
File "/usr/lib/python3.6/site-packages/qutebrowser/config/websettings.py", line 72, in set
self._set(value, settings=settings)
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/webenginesettings.py", line 154, in _set
filenames = [self._find_installed(code) for code in value]
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/webenginesettings.py", line 154, in <listcomp>
filenames = [self._find_installed(code) for code in value]
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/webenginesettings.py", line 143, in _find_installed
local_filename = spell.local_filename(code)
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/spell.py", line 64, in local_filename
all_installed = local_files(code)
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/spell.py", line 51, in local_files
for matching_dict in sorted(matching_dicts, key=version, reverse=True):
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/spell.py", line 36, in version
.format(filename))
ValueError: the given dictionary file name is malformed: /usr/share/qt/qtwebengine_dictionaries/en-US.bdic

# Fixed code
def _open_editor_cb(self, elem):
    """Open editor after the focus elem was found in open_editor."""
    if elem is None:
        message.error("No element focused!")
        return
    if not elem.is_editable(strict=True):
        message.error("Focused element is not editable!")
        return

    text = elem.value()
    if text is None:
        message.error("Could not get text from the focused element.")
        return
    assert isinstance(text, str), text

    caret_position = elem.caret_position()

    ed = editor.ExternalEditor(watch=True, parent=self._tabbed_browser)
    ed.file_updated.connect(functools.partial(self.on_file_updated, ed, elem))
    ed.editing_finished.connect(
        lambda: mainwindow.raise_window(objreg.last_focused_window(), alert=False)
    )
    ed.edit(text, caret_position)