Fixed MR handling when GitLab CI project is not present

app/models/project_services/gitlab_ci_service.rb

@@ -46,8 +46,10 @@ class GitlabCiService < CiService
     end
 
     ci_project = Ci::Project.find_by(gitlab_id: project.id)
+    if ci_project
       Ci::CreateCommitService.new.execute(ci_project, data)
     end
+  end
 
   def get_ci_commit(sha, ref)
     Ci::Project.find(project.gitlab_ci_project).commits.find_by_sha_and_ref!(sha, ref)
@@ -85,8 +87,10 @@ class GitlabCiService < CiService
   end
 
   def build_page(sha, ref)
+    if project.gitlab_ci_project.present?
       Ci::RoutesHelper.ci_project_ref_commits_path(project.gitlab_ci_project, ref, sha)
     end
+  end
 
   def title
     'GitLab CI'

app/views/projects/merge_requests/widget/_heading.html.haml

@@ -10,6 +10,7 @@
         %span CI build #{status}
         for #{@merge_request.last_commit_short_sha}.
         %span.ci-coverage
+        - if ci_build_details_path(@merge_request)
           = link_to "View build details", ci_build_details_path(@merge_request), :"data-no-turbolink" => "data-no-turbolink"
 
     .ci_widget