Problem edit ticket on MySql

[egeoffroy@…]

Following error when edit an existing ticket.

Traceback (most recent call last):
  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 387, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 238, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.3/site-packages/trac/ticket/web_ui.py", line 302, in process_request
    get_reporter_id(req, 'author'))
  File "/usr/lib/python2.3/site-packages/trac/ticket/web_ui.py", line 615, in _insert_ticket_data
    for change in self.grouped_changelog_entries(ticket, db):
  File "/usr/lib/python2.3/site-packages/trac/ticket/web_ui.py", line 662, in grouped_changelog_entries
    changelog = ticket.get_changelog(when=when, db=db)
  File "/usr/lib/python2.3/site-packages/trac/ticket/model.py", line 299, in get_changelog
    "ORDER BY time", (self.id,  str(self.id), self.id))
  File "/usr/lib/python2.3/site-packages/trac/db/util.py", line 50, in execute
    return self.cursor.execute(sql_escape_percent(sql), args)
  File "/usr/lib/python2.3/site-packages/trac/db/util.py", line 50, in execute
    return self.cursor.execute(sql_escape_percent(sql), args)
  File "/usr/lib/python2.3/site-packages/MySQLdb/cursors.py", line 137, in execute
    self.errorhandler(self, exc, value)
  File "/usr/lib/python2.3/site-packages/MySQLdb/connections.py", line 33, in defaulterrorhandler
    raise errorclass, errorvalue
OperationalError: (1267, "Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation 'UNION'")

[thatch]

Fixing description, and duplicate of #3182