backtrace when add comment to new issue

[mcepl]

Connecting...
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/matej/.vim/plugin/trac.py", line 745, in add_comment
    trac.ticket_view(trac.ticket.current_ticket_id)
  File "/home/matej/.vim/plugin/trac.py", line 1380, in ticket_view
    self.uiticket.ticketwindow.write(self.ticket.getTicket(id))
  File "/home/matej/.vim/plugin/trac.py", line 53, in write
    msg = msg.encode('utf-8', 'ignore')
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc4 in position 380: ordina
l not in range(128)
Press ENTER or type command to continue

I have successfully created a new issue and then tried to add comment to it with TTAddComment (the issue is https://fedorahosted.org/bugzilla-triage-scripts/ticket/9 ; yes, I forgot to add Description first)