Redmine

Hi.

I have used plugin to import csv file, and update existent issues. After this, when I go to rss-feed or open my user page I got 500 error. Here is log saying:

Started GET "/projects/btt/issues.atom?key=e736bac674718e1291974915ecf0379d89cce4d3" for 46.211.120.252 at 2012-08-24 17:25:16 +0200
Processing by IssuesController#index as ATOM
  Parameters: {"key"=>"e736bac674718e1291974915ecf0379d89cce4d3", "project_id"=>"btt"}
Completed 500 Internal Server Error in 117ms

NoMethodError (undefined method `to_datetime' for nil:NilClass):
  app/controllers/application_controller.rb:345:in `block in render_feed'
  app/controllers/application_controller.rb:345:in `sort!'
  app/controllers/application_controller.rb:345:in `render_feed'
  app/controllers/issues_controller.rb:87:in `block (2 levels) in index'
  app/controllers/issues_controller.rb:82:in `index'

or user page error:

Started GET "/users/4" for 46.211.120.252 at 2012-08-24 17:39:39 +0200
Processing by UsersController#show as HTML
  Parameters: {"id"=>"4"}
Completed 500 Internal Server Error in 99ms

NoMethodError (undefined method `to_datetime' for nil:NilClass):
  lib/redmine/activity/fetcher.rb:80:in `block in events'
  lib/redmine/activity/fetcher.rb:80:in `sort!'
  lib/redmine/activity/fetcher.rb:80:in `events'
  app/controllers/users_controller.rb:68:in `show'

How can I fix it? Or it is a redmine bug (no checking for the variable type)? Maybe importer not write properly change date of the activity?

Thanks.