I got this during shutdown once:
Traceback (most recent call last):
File ".../qutebrowser/mainwindow/mainwindow.py", line 552, in closeEvent
File ".../qutebrowser/mainwindow/mainwindow.py", line 538, in _do_close
File ".../qutebrowser/mainwindow/tabbedbrowser.py", line 218, in shutdown
self._remove_tab(tab)
File ".../qutebrowser/mainwindow/tabbedbrowser.py", line 280, in _remove_tab
tab.shutdown()
File ".../qutebrowser/browser/webengine/webenginetab.py", line 536, in shutdown
log.stub()
File ".../qutebrowser/utils/log.py", line 151, in stub
function = inspect.stack()[1][3]
File "/usr/lib64/python3.5/inspect.py", line 1464, in stack
return getouterframes(sys._getframe(1), context)
File "/usr/lib64/python3.5/inspect.py", line 1441, in getouterframes
frameinfo = (frame,) + getframeinfo(frame, context)
File "/usr/lib64/python3.5/inspect.py", line 1414, in getframeinfo
lines, lnum = findsource(frame)
File "/usr/lib64/python3.5/inspect.py", line 804, in findsource
if pat.match(lines[lnum]): break
IndexError: list index out of range
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