TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'

[valentin.balt@…]

How to Reproduce

While doing a GET operation on /downloads/4, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'action': 'get-file', 'id': u'4'}

User Agent was: Mozilla/5.0 (X11; U; Linux x86_64; ru; rv:1.9.0.8) Gecko/2009032600 SUSE/3.0.8-1.1.1 Firefox/3.0.8

System Information

Trac	0.11.4
Python	2.5.1 (r251:54863, Sep 22 2007, 01:43:31) [GCC 4.2.1 (SUSE Linux)]
setuptools	0.6c9
MySQL	server: "5.0.51a", client: "5.0.51a", thread-safe: 0
MySQLdb	1.2.1_p2
Genshi	0.5.1
mod_python	3.3.1
Subversion	1.4.4 (r25188)
jQuery:	1.2.6

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/trac/web/main.py", line 435, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.5/site-packages/trac/web/main.py", line 205, in dispatch
    resp = chosen_handler.process_request(req)
  File "build/bdist.linux-i686/egg/tracdownloads/core.py", line 75, in process_request
    return api.process_downloads(context) + (None,)
  File "build/bdist.linux-i686/egg/tracdownloads/api.py", line 276, in process_downloads
    self._do_action(context, modes)
  File "build/bdist.linux-i686/egg/tracdownloads/api.py", line 378, in _do_action
    new_download = {'count' : download['count'] + 1}
TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'

[anonymous]

update download set count = 0 where count is null;

Just run this SQL statement.