TypeError: 'NoneType' object is not iterable

[muhammad.ali.online111@…]

How to Reproduce

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

(please provide additional details here)

Request parameters:

{}

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0

System Information

Trac	1.2.1
Docutils	0.13.1
Genshi	0.7 (with speedups)
mod_wsgi	4.3.0 (WSGIProcessGroup WSGIApplicationGroup %{GLOBAL})
MySQL	server: "5.6.37", client: "5.7.21", thread-safe: 1
MySQLdb	1.2.4
Python	2.7.12 (default, Nov 20 2017, 18:23:56) [GCC 5.4.0 20160609]
setuptools	34.3.3
jQuery	1.11.3
jQuery UI	1.11.4
jQuery Timepicker	1.5.5

Enabled Plugins

SimpleMultiProject	0.6.0.dev0
trac-oidc	0.1.5

Interface Customization

shared-htdocs
shared-templates
site-htdocs	common, site
site-templates

Python Traceback

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/trac/web/main.py", line 623, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python2.7/dist-packages/trac/web/main.py", line 249, in dispatch
    self._post_process_request(req, *resp)
  File "/usr/local/lib/python2.7/dist-packages/trac/web/main.py", line 453, in _post_process_request
    resp = f.post_process_request(req, *resp[:-1])
  File "build/bdist.linux-x86_64/egg/simplemultiproject/ticket.py", line 78, in post_process_request
    self._add_milestones_maps(req, data['ticket'], is_newticket)
  File "build/bdist.linux-x86_64/egg/simplemultiproject/ticket.py", line 112, in _add_milestones_maps
    for milestone in sorted(milestones, key=itemgetter(0)):
TypeError: 'NoneType' object is not iterable

[Jun Omae]

PluginIssue (​th:SimpleMultiProjectPlugin).