diff --git a/src/main/scala/gitbucket/core/controller/PullRequestsController.scala b/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
index ce7a353..058b1eb 100644
--- a/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
+++ b/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
@@ -294,7 +294,7 @@
       originRepositoryName <- if(originOwner == forkedOwner) {
         // Self repository
         Some(forkedRepository.name)
-      }else if(forkedRepository.repository.originUserName == None){
+      } else if(forkedRepository.repository.originUserName.isEmpty){
         // when ForkedRepository is the original repository
         getForkedRepositories(forkedRepository.owner, forkedRepository.name).find(_._1 == originOwner).map(_._2)
       } else if(Some(originOwner) == forkedRepository.repository.originUserName){