2020-01-25 09:40:16,651 ERROR:basetabs:/xhtml: Unable to send custom xhtml                                                                                                                               
Traceback (most recent call last):
  File "/usr/lib/python3.8/xml/sax/expatreader.py", line 217, in feed
    self._parser.Parse(data, isFinal)
xml.parsers.expat.ExpatError: syntax error: line 1, column 0                                                                                                                                             

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/poezio/tabs/basetabs.py", line 659, in generate_xhtml_message                                                                                                   
    xhtml.xhtml_to_poezio_colors(arg, force=True))
  File "/usr/lib/python3.8/site-packages/poezio/xhtml.py", line 460, in xhtml_to_poezio_colors
    parser.parse(BytesIO(xml))
  File "/usr/lib/python3.8/xml/sax/expatreader.py", line 111, in parse
    xmlreader.IncrementalParser.parse(self, source)
  File "/usr/lib/python3.8/xml/sax/xmlreader.py", line 125, in parse
    self.feed(buffer)
  File "/usr/lib/python3.8/xml/sax/expatreader.py", line 221, in feed
    self._err_handler.fatalError(exc)
  File "/usr/lib/python3.8/xml/sax/handler.py", line 38, in fatalError
    raise exception
xml.sax._exceptions.SAXParseException: <unknown>:1:0: syntax error