Redmine

After upgrade from 2.4-dev to 2.4.5 started in some projects encounter errors:
undefined method `>' for nil:NilClass

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  Current user: kaa (id=1)
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  [1m[35mIssuePriority Load (0.1ms)[0m  SELECT `enumerations`.* FROM `enumerations` WHERE `enumerations`.`type` IN ('IssuePriority') AND `enumerations`.`is_default` = 1 ORDER BY enumerations.position ASC LIMIT 1
  [1m[36mProject Load (0.1ms)[0m  [1mSELECT `projects`.* FROM `projects` WHERE `projects`.`id` = 39 LIMIT 1[0m
  [1m[35mTracker Load (0.2ms)[0m  SELECT `trackers`.* FROM `trackers` INNER JOIN `projects_trackers` ON `trackers`.`id` = `projects_trackers`.`tracker_id` WHERE `projects_trackers`.`project_id` = 39 AND `trackers`.`id` = 1 ORDER BY trackers.position LIMIT 1
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT `issue_statuses`.* FROM `issue_statuses` WHERE `issue_statuses`.`is_default` = 1 LIMIT 1[0m
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  [1m[35mIssueStatus Load (0.1ms)[0m  SELECT `issue_statuses`.* FROM `issue_statuses` WHERE `issue_statuses`.`id` IN (5, 4, 3, 2, 6)
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  [1m[35mCACHE (0.0ms)[0m  SELECT `roles`.* FROM `roles` 
  [1m[36mWorkflowPermission Load (0.1ms)[0m  [1mSELECT `workflows`.* FROM `workflows` WHERE `workflows`.`type` IN ('WorkflowPermission') AND `workflows`.`tracker_id` = 1 AND `workflows`.`old_status_id` = 1 AND `workflows`.`role_id` IN (1, 2, 3, 4, 5, 6, 7, 8)[0m
  [1m[35mTracker Load (0.2ms)[0m  SELECT `trackers`.* FROM `trackers` WHERE `trackers`.`id` = 1 LIMIT 1
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT `roles`.* FROM `roles` [0m
  [1m[35mCACHE (0.0ms)[0m  SELECT `workflows`.* FROM `workflows` WHERE `workflows`.`type` IN ('WorkflowPermission') AND `workflows`.`tracker_id` = 1 AND `workflows`.`old_status_id` = 1 AND `workflows`.`role_id` IN (1, 2, 3, 4, 5, 6, 7, 8)
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT `issue_statuses`.* FROM `issue_statuses` WHERE `issue_statuses`.`is_default` = 1 LIMIT 1[0m
  [1m[35mCACHE (0.0ms)[0m  SELECT `roles`.* FROM `roles` 
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT `workflows`.* FROM `workflows` WHERE `workflows`.`type` IN ('WorkflowTransition') AND `workflows`.`old_status_id` = 1 AND (role_id IN (1,2,3,4,5,6,7,8) AND tracker_id = 1 AND ((author = 0 AND assignee = 0) OR author = 1))[0m
  [1m[35mCACHE (0.0ms)[0m  SELECT `issue_statuses`.* FROM `issue_statuses` WHERE `issue_statuses`.`id` IN (5, 4, 3, 2, 6)
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT `issue_statuses`.* FROM `issue_statuses` WHERE `issue_statuses`.`is_default` = 1 LIMIT 1[0m
  [1m[35mCACHE (0.0ms)[0m  SELECT `roles`.* FROM `roles` 
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT `workflows`.* FROM `workflows` WHERE `workflows`.`type` IN ('WorkflowTransition') AND `workflows`.`old_status_id` = 1 AND (role_id IN (1,2,3,4,5,6,7,8) AND tracker_id = 1 AND ((author = 0 AND assignee = 0) OR author = 1))[0m
  [1m[35mCACHE (0.0ms)[0m  SELECT `issue_statuses`.* FROM `issue_statuses` WHERE `issue_statuses`.`id` IN (5, 4, 3, 2, 6)
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  [1m[36mIssueCustomField Load (0.2ms)[0m  [1mSELECT `custom_fields`.* FROM `custom_fields` INNER JOIN `custom_fields_trackers` ON `custom_fields`.`id` = `custom_fields_trackers`.`custom_field_id` WHERE `custom_fields`.`type` IN ('IssueCustomField') AND `custom_fields_trackers`.`tracker_id` = 1[0m
  [1m[35mIssueCustomField Load (0.1ms)[0m  SELECT `custom_fields`.* FROM `custom_fields` WHERE `custom_fields`.`type` IN ('IssueCustomField') AND (is_for_all = 1 OR id IN (SELECT DISTINCT cfp.custom_field_id FROM custom_fields_projects cfp WHERE cfp.project_id = 39)) ORDER BY custom_fields.position ASC
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT `roles`.* FROM `roles` [0m
  [1m[35mCACHE (0.0ms)[0m  SELECT `workflows`.* FROM `workflows` WHERE `workflows`.`type` IN ('WorkflowPermission') AND `workflows`.`tracker_id` = 1 AND `workflows`.`old_status_id` = 1 AND `workflows`.`role_id` IN (1, 2, 3, 4, 5, 6, 7, 8)
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT `roles`.* FROM `roles` [0m
  [1m[35mCACHE (0.0ms)[0m  SELECT `workflows`.* FROM `workflows` WHERE `workflows`.`type` IN ('WorkflowPermission') AND `workflows`.`tracker_id` = 1 AND `workflows`.`old_status_id` = 1 AND `workflows`.`role_id` IN (1, 2, 3, 4, 5, 6, 7, 8)
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT `issue_statuses`.* FROM `issue_statuses` WHERE `issue_statuses`.`is_default` = 1 LIMIT 1[0m
  [1m[35mCACHE (0.0ms)[0m  SELECT `roles`.* FROM `roles` 
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT `workflows`.* FROM `workflows` WHERE `workflows`.`type` IN ('WorkflowTransition') AND `workflows`.`old_status_id` = 1 AND (role_id IN (1,2,3,4,5,6,7,8) AND tracker_id = 1 AND ((author = 0 AND assignee = 0) OR author = 1))[0m
  [1m[35mCACHE (0.0ms)[0m  SELECT `issue_statuses`.* FROM `issue_statuses` WHERE `issue_statuses`.`id` IN (5, 4, 3, 2, 6)
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT `issue_statuses`.* FROM `issue_statuses` WHERE `issue_statuses`.`is_default` = 1 LIMIT 1[0m
  [1m[35mUser Load (0.2ms)[0m  SELECT DISTINCT `users`.* FROM `users` INNER JOIN `members` ON `members`.`user_id` = `users`.`id` WHERE `users`.`type` IN ('User', 'AnonymousUser') AND `users`.`status` = 1 AND (members.project_id = 39)
  [1m[36m (0.1ms)[0m  [1mBEGIN[0m
  [1m[35m (0.0ms)[0m  ROLLBACK
Completed 500 Internal Server Error in 273.3ms

NoMethodError (undefined method `>' for nil:NilClass):
  app/models/custom_field.rb:355:in `validate_field_value_format'
  app/models/custom_field.rb:334:in `validate_field_value'
  app/models/custom_field_value.rb:46:in `validate_value'
  lib/plugins/acts_as_customizable/lib/acts_as_customizable.rb:126:in `each'
  lib/plugins/acts_as_customizable/lib/acts_as_customizable.rb:126:in `validate_custom_field_values'
  app/controllers/issues_controller.rb:146:in `create'

Environment:
  Redmine version                2.4.5.stable
  Ruby version                   2.0.0-p451 (2014-02-24) [i686-linux]
  Rails version                  3.2.17
  Environment                    development
  Database adapter               Mysql2
SCM:
  Subversion                     1.6.12
  Cvs                            1.12.13
  Git                            1.7.2.5
  Filesystem                     
Redmine plugins:
  recaptcha                      1.0.0
  redmine_agile                  1.1.2-light
  redmine_people                 0.1.8
  redmine_questions              0.0.5