Redmine

Ruby 1.9.3-p194 / Redmine 2.0.4 / mysql 5.5 with backlogs and wk_time plugins

On updating one of the older issue this error crops up.

NoMethodError (undefined method `<' for nil:NilClass):  app/models/issue.rb:731:in `block in save_issue_with_child_records'
  app/models/issue.rb:718:in `save_issue_with_child_records'
  app/controllers/issues_controller.rb:182:in `update'

Seems like it happens when trying to run this line:

Redmine::Hook.call_hook(:controller_issues_edit_after_save, { :params => params, :issue => self, :time_entry => @time_entry, :journal => @current_journal})

Any help would be greatly appreciated!