# Buggy code
def _chromium_version():
    """Get the Chromium version for QtWebEngine.

    This can also be checked by looking at this file with the right Qt tag:
    https://github.com/qt/qtwebengine/blob/dev/tools/scripts/version_resolver.py#L41

    Quick reference:
    Qt 5.7:  Chromium 49
    Qt 5.8:  Chromium 53
    Qt 5.9:  Chromium 56
    Qt 5.10: Chromium 61
    Qt 5.11: Chromium 63
    Qt 5.12: Chromium 65 (?)
    """
    if QWebEngineProfile is None:
        # This should never happen
        return "unavailable"
    profile = QWebEngineProfile()
    ua = profile.httpUserAgent()
    match = re.search(r" Chrome/([^ ]*) ", ua)
    if not match:
        log.misc.error("Could not get Chromium version from: {}".format(ua))
        return "unknown"
    return match.group(1)


# 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 _chromium_version():
    """Get the Chromium version for QtWebEngine.

    This can also be checked by looking at this file with the right Qt tag:
    https://github.com/qt/qtwebengine/blob/dev/tools/scripts/version_resolver.py#L41

    Quick reference:
    Qt 5.7:  Chromium 49
    Qt 5.8:  Chromium 53
    Qt 5.9:  Chromium 56
    Qt 5.10: Chromium 61
    Qt 5.11: Chromium 65
    Qt 5.12: Chromium 69 (?)

    Also see https://www.chromium.org/developers/calendar
    """
    if QWebEngineProfile is None:
        # This should never happen
        return "unavailable"
    profile = QWebEngineProfile()
    ua = profile.httpUserAgent()
    match = re.search(r" Chrome/([^ ]*) ", ua)
    if not match:
        log.misc.error("Could not get Chromium version from: {}".format(ua))
        return "unknown"
    return match.group(1)