diff --git a/app/views/pull_requests/show.json.jbuilder b/app/views/pull_requests/show.json.jbuilder
index 71f0641b6..b316043a7 100644
--- a/app/views/pull_requests/show.json.jbuilder
+++ b/app/views/pull_requests/show.json.jbuilder
@@ -25,8 +25,8 @@ end
 json.pull_request do
   json.extract! @pull_request, :id,:base, :head, :status,:fork_project_id, :is_original
   json.pull_request_staus @pull_request.status == 1 ? "merged" : (@pull_request.status == 2 ? "closed" : "open")
-  json.fork_project_user @pull_request&.fork_project&.owner.try(:login)
-  json.fork_project_user_name @pull_request&.fork_project&.owner.try(:show_real_name)
+  json.fork_project_user @pull_request.fork_project_id.present? ? @pull_request&.fork_project&.owner.try(:login) : @pull_request.project&.owner.try(:login)
+  json.fork_project_user_name @pull_request.fork_project_id.present? ? @pull_request&.fork_project&.owner.try(:show_real_name) : @pull_request.project&.owner.try(:show_real_name)
   json.create_user @pull_request&.user&.login
   json.mergeable @gitea_pull["mergeable"]
   json.state @gitea_pull["state"]