diff --git a/kallithea/controllers/pullrequests.py b/kallithea/controllers/pullrequests.py
--- a/kallithea/controllers/pullrequests.py
+++ b/kallithea/controllers/pullrequests.py
@@ -466,6 +466,8 @@ class PullrequestsController(BaseRepoCon
     def copy_update(self, repo_name, pull_request_id):
         old_pull_request = PullRequest.get_or_404(pull_request_id)
         assert old_pull_request.other_repo.repo_name == repo_name
+        if old_pull_request.is_closed():
+            raise HTTPForbidden()
 
         org_repo = RepoModel()._get_repo(old_pull_request.org_repo.repo_name)
         org_ref_type, org_ref_name, org_rev = old_pull_request.org_ref.split(':')
diff --git a/kallithea/templates/pullrequests/pullrequest_show.html b/kallithea/templates/pullrequests/pullrequest_show.html
--- a/kallithea/templates/pullrequests/pullrequest_show.html
+++ b/kallithea/templates/pullrequests/pullrequest_show.html
@@ -194,7 +194,7 @@ ${self.repo_context_bar('showpullrequest
               %endif
               <div class="msg-div">${c.update_msg_other}</div>
             </div>
-            %if c.available:
+            %if c.available and not c.pull_request.is_closed():
               <div class="buttons">
                 ${h.submit('copy_update',_('Create pull request update'),class_="btn btn-small")}
               </div>