IntegrityError: (1062, "Duplicate entry '[email protected]' for key 'PRIMARY'")

[Eup]

How to Reproduce

While doing a POST operation on /login, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'__FORM_TOKEN': u'081754b87cb69098d1a8570b',
 'nick': u'EupLeung',
 'referer': u''}

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Firefox/31.0

System Information

System information not available

Enabled Plugins

Plugin information not available

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 513, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 235, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.4/site-packages/trac/web/auth.py", line 126, in process_request
    ret = self._do_login(req)
  File "/usr/lib/python2.4/site-packages/trac/web/auth.py", line 231, in _do_login
    @self.env.with_transaction()
  File "/usr/lib/python2.4/site-packages/trac/db/api.py", line 77, in transaction_wrapper
    fn(ldb)
  File "/usr/lib/python2.4/site-packages/trac/web/auth.py", line 236, in store_authnick
    (remote_user, nick))
  File "/usr/lib/python2.4/site-packages/trac/db/util.py", line 65, in execute
    return self.cursor.execute(sql_escape_percent(sql), args)
  File "/usr/lib64/python2.4/site-packages/MySQL_python-1.2.4b4-py2.4-linux-x86_64.egg/MySQLdb/cursors.py", line 202, in execute
    self.errorhandler(self, exc, value)
  File "/usr/lib64/python2.4/site-packages/MySQL_python-1.2.4b4-py2.4-linux-x86_64.egg/MySQLdb/connections.py", line 36, in defaulterrorhandler
    raise errorclass, errorvalue
IntegrityError: (1062, "Duplicate entry '[email protected]' for key 'PRIMARY'")

[Frank Mehnert]

Duplicate of #12460.