500 error

mileston click 500 Error

synology docker gitlab 11.11.8

error log

Started GET "/engineer/support/milestones/13" for 203.234.105.98 at 2020-11-05 15:01:34 +0900
Processing by Projects::MilestonesController#show as HTML
  Parameters: {"namespace_id"=>"engineer", "project_id"=>"support", "id"=>"13"}
Completed 500 Internal Server Error in 344ms (ActiveRecord: 37.6ms)

ActionView::Template::Error (can't convert Hash into Integer):
    72:
    73:     - if !project || can?(current_user, :read_issue, project)
    74:       .block.issues
    75:         .sidebar-collapsed-icon.has-tooltip{ title: milestone_issues_tooltip_text(milestone), data: { container: 'body', html: 'true', placement: 'left', boundary: 'viewport' } }
    76:           %strong
    77:             = custom_icon('issues')
    78:           %span= milestone.issues_visible_to_user(current_user).count

app/helpers/milestones_helper.rb:149:in `milestone_issues_tooltip_text'
app/views/shared/milestones/_sidebar.html.haml:75:in `_app_views_shared_milestones__sidebar_html_haml___2599146441402559332_149785380'
app/views/projects/milestones/show.html.haml:71:in `_app_views_projects_milestones_show_html_haml___1057075381107846003_170086600'
app/controllers/application_controller.rb:117:in `render'
lib/gitlab/session.rb:11:in `with_session'
app/controllers/application_controller.rb:439:in `set_session_storage'
lib/gitlab/i18n.rb:55:in `with_locale'
lib/gitlab/i18n.rb:61:in `with_user_locale'
app/controllers/application_controller.rb:435:in `set_locale'
lib/gitlab/middleware/multipart.rb:103:in `call'
lib/gitlab/request_profiler/middleware.rb:16:in `call'
lib/gitlab/middleware/go.rb:20:in `call'
lib/gitlab/etag_caching/middleware.rb:13:in `call'
lib/gitlab/middleware/correlation_id.rb:16:in `block in call'
lib/gitlab/middleware/correlation_id.rb:15:in `call'
lib/gitlab/middleware/read_only/controller.rb:40:in `call'
lib/gitlab/middleware/read_only.rb:18:in `call'
lib/gitlab/middleware/basic_health_check.rb:25:in `call'
lib/gitlab/request_context.rb:26:in `call'
lib/gitlab/metrics/requests_rack_middleware.rb:29:in `call'
lib/gitlab/middleware/release_env.rb:12:in `call'