# Buggy code
def _on_load_finished(self, ok):
    """Display a static error page if JavaScript is disabled."""
    super()._on_load_finished(ok)
    js_enabled = self.settings.test_attribute("content.javascript.enabled")
    if not ok and not js_enabled:
        self.dump_async(self._error_page_workaround)

    if ok and self._reload_url is not None:
        # WORKAROUND for https://bugreports.qt.io/browse/QTBUG-66656
        log.config.debug(
            "Reloading {} because of config change".format(
                self._reload_url.toDisplayString()
            )
        )
        QTimer.singleShot(100, lambda url=self._reload_url: self.openurl(url))
        self._reload_url = None

    if not qtutils.version_check("5.10", compiled=False):
        # We can't do this when we have the loadFinished workaround as that
        # sometimes clears icons without loading a new page.
        # In general, this is handled by Qt, but when loading takes long,
        # the old icon is still displayed.
        self.icon_changed.emit(QIcon())


# 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 _on_load_finished(self, ok):
    """Display a static error page if JavaScript is disabled."""
    super()._on_load_finished(ok)
    js_enabled = self.settings.test_attribute("content.javascript.enabled")
    if not ok and not js_enabled:
        self.dump_async(self._error_page_workaround)

    if ok and self._reload_url is not None:
        # WORKAROUND for https://bugreports.qt.io/browse/QTBUG-66656
        log.config.debug(
            "Loading {} again because of config change".format(
                self._reload_url.toDisplayString()
            )
        )
        QTimer.singleShot(
            100, lambda url=self._reload_url: self.openurl(url, predict=False)
        )
        self._reload_url = None

    if not qtutils.version_check("5.10", compiled=False):
        # We can't do this when we have the loadFinished workaround as that
        # sometimes clears icons without loading a new page.
        # In general, this is handled by Qt, but when loading takes long,
        # the old icon is still displayed.
        self.icon_changed.emit(QIcon())