IntegrityError: (1062, "Duplicate entry 'nathan@financia-1-query_href' for key 1")

How to Reproduce

While doing a GET operation on /report/7, Trac issued an internal error.

''(please provide additional details here)''

Appears to be related to cookies, as the error does not occur if cookies are cleared. However, obviously, this also removes any active sessions. Tested in Firefox 3.6, IE 8 and Chrome 4.1.249.

Request parameters:

{'id': u'7'}

System Information

|| Trac || 0.11.1 ||

|| Python || 2.4.3 (#1, May 24 2008, 13:47:28) [GCC 4.1.2 20070626 (Red Hat 4.1.2-14)] ||

|| setuptools || 0.6c5 ||

|| MySQL || server: "5.0.45", client: "5.0.45", thread-safe: 0 ||

|| MySQLdb || 1.2.2 ||

|| Genshi || 0.5.1 ||

|| mod_python || 3.2.8 ||

|| Subversion || 1.4.2 (r22196) ||

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/Trac-0.11.1-py2.4.egg/trac/web/main.py", line 423, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.4/site-packages/Trac-0.11.1-py2.4.egg/trac/web/main.py", line 222, in dispatch
    req.session.save()
  File "/usr/lib/python2.4/site-packages/Trac-0.11.1-py2.4.egg/trac/web/session.py", line 102, in save
    "VALUES(%s,%s,%s,%s)", attrs)
  File "/usr/lib/python2.4/site-packages/Trac-0.11.1-py2.4.egg/trac/db/util.py", line 57, in executemany
    return self.cursor.executemany(sql_escape_percent(sql), args)
  File "build/bdist.linux-i686/egg/MySQLdb/cursors.py", line 218, in executemany
  File "build/bdist.linux-i686/egg/MySQLdb/cursors.py", line 312, in _query
  File "build/bdist.linux-i686/egg/MySQLdb/cursors.py", line 276, in _do_query
IntegrityError: (1062, "Duplicate entry 'nathan@financia-1-query_href' for key 1")