# Buggy code
def _on_renderer_process_terminated(self, tab, status, code):
    """Show an error when a renderer process terminated."""
    if status == browsertab.TerminationStatus.normal:
        return

    messages = {
        browsertab.TerminationStatus.abnormal: "Renderer process exited with status {}".format(
            code
        ),
        browsertab.TerminationStatus.crashed: "Renderer process crashed",
        browsertab.TerminationStatus.killed: "Renderer process was killed",
        browsertab.TerminationStatus.unknown: "Renderer process did not start",
    }
    msg = messages[status]

    def show_error_page(html):
        tab.set_html(html)
        log.webview.error(msg)

    if qtutils.version_check("5.9", compiled=False):
        url_string = tab.url(requested=True).toDisplayString()
        error_page = jinja.render(
            "error.html",
            title="Error loading {}".format(url_string),
            url=url_string,
            error=msg,
        )
        QTimer.singleShot(100, lambda: show_error_page(error_page))
    else:
        # WORKAROUND for https://bugreports.qt.io/browse/QTBUG-58698
        message.error(msg)
        self._remove_tab(tab, crashed=True)
        if self.count() == 0:
            self.tabopen(QUrl("about:blank"))


# 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_renderer_process_terminated(self, tab, status, code):
    """Show an error when a renderer process terminated."""
    if status == browsertab.TerminationStatus.normal:
        return

    messages = {
        browsertab.TerminationStatus.abnormal: "Renderer process exited with status {}".format(
            code
        ),
        browsertab.TerminationStatus.crashed: "Renderer process crashed",
        browsertab.TerminationStatus.killed: "Renderer process was killed",
        browsertab.TerminationStatus.unknown: "Renderer process did not start",
    }
    msg = messages[status]

    def show_error_page(html):
        tab.set_html(html)
        log.webview.error(msg)

    if qtutils.version_check("5.9", compiled=False):
        url_string = tab.url(requested=True).toDisplayString()
        error_page = jinja.render(
            "error.html",
            title="Error loading {}".format(url_string),
            url=url_string,
            error=msg,
        )
        QTimer.singleShot(100, lambda: show_error_page(error_page))
    else:
        # WORKAROUND for https://bugreports.qt.io/browse/QTBUG-58698
        message.error(msg)
        self._remove_tab(tab, crashed=True)
        if self.widget.count() == 0:
            self.tabopen(QUrl("about:blank"))