Redmine

Hi,

i'm receiving an error 500 using the report and details link of a project

inspecting the redmine's log i've found this message :

TypeError (can't dup NilClass):
app/models/query.rb:366:in `add_filter'
app/models/time_entry_query.rb:35:in `initialize'
app/models/query.rb:254:in `build_from_params'
app/controllers/timelog_controller.rb:78:in `report'
lib/redmine/sudo_mode.rb:63:in `sudo_mode'

Environment:
Redmine version 3.1.2.stable
Ruby version 2.0.0-p647 (2015-08-18) [x86_64-linux]
Rails version 4.2.4
Environment production
Database adapter Mysql2
SCM:
Subversion 1.8.13
Git 2.6.1
Filesystem
Redmine plugins:
redmine_agile 1.3.12
redmine_involvement_filter 0.2.0

i'm attaching the production log (in debug mode) as a zip file

Available for any clarification

Thanks for any support

Best Regards

Paolo