diff --git a/src/main/scala/gitbucket/core/controller/PullRequestsController.scala b/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
index b35f66c..036fa2d 100644
--- a/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
+++ b/src/main/scala/gitbucket/core/controller/PullRequestsController.scala
@@ -517,14 +517,18 @@
     val targetRepository = (for {
       parentUserName <- repository.repository.parentUserName
       parentRepoName <- repository.repository.parentRepositoryName
-      parentRepository <- getRepository(parentUserName, parentRepoName).orElse(Some(repository))
+      parentRepository <- getRepository(parentUserName, parentRepoName)
     } yield {
       parentRepository
     }).getOrElse {
       repository
     }
 
-    html.proposals(branches, targetRepository, repository)
+    val proposedBranches = branches.filter { branch =>
+      getPullRequestsByRequest(repository.owner, repository.name, branch, None).isEmpty
+    }
+
+    html.proposals(proposedBranches, targetRepository, repository)
   })
 
   /**
diff --git a/src/main/scala/gitbucket/core/service/PullRequestService.scala b/src/main/scala/gitbucket/core/service/PullRequestService.scala
index 1ee36f9..0ecf20f 100644
--- a/src/main/scala/gitbucket/core/service/PullRequestService.scala
+++ b/src/main/scala/gitbucket/core/service/PullRequestService.scala
@@ -79,7 +79,7 @@
       commitIdFrom,
       commitIdTo)
 
-  def getPullRequestsByRequest(userName: String, repositoryName: String, branch: String, closed: Boolean)
+  def getPullRequestsByRequest(userName: String, repositoryName: String, branch: String, closed: Option[Boolean])
                               (implicit s: Session): List[PullRequest] =
     PullRequests
       .join(Issues).on { (t1, t2) => t1.byPrimaryKey(t2.userName, t2.repositoryName, t2.issueId) }
@@ -87,7 +87,7 @@
         (t1.requestUserName       === userName.bind) &&
         (t1.requestRepositoryName === repositoryName.bind) &&
         (t1.requestBranch         === branch.bind) &&
-        (t2.closed                === closed.bind)
+        (t2.closed                === closed.get.bind, closed.isDefined)
       }
       .map { case (t1, t2) => t1 }
       .list
@@ -118,7 +118,7 @@
    * Fetch pull request contents into refs/pull/${issueId}/head and update pull request table.
    */
   def updatePullRequests(owner: String, repository: String, branch: String)(implicit s: Session): Unit =
-    getPullRequestsByRequest(owner, repository, branch, false).foreach { pullreq =>
+    getPullRequestsByRequest(owner, repository, branch, Some(false)).foreach { pullreq =>
       if(Repositories.filter(_.byRepository(pullreq.userName, pullreq.repositoryName)).exists.run){
         // Update the git repository
         val (commitIdTo, commitIdFrom) = JGitUtil.updatePullRequest(