diff --git a/kallithea/controllers/pullrequests.py b/kallithea/controllers/pullrequests.py
--- a/kallithea/controllers/pullrequests.py
+++ b/kallithea/controllers/pullrequests.py
@@ -632,6 +632,7 @@ class PullrequestsController(BaseRepoCon
     @HasRepoPermissionLevelDecorator('read')
     @jsonify
     def comment(self, repo_name, pull_request_id):
+        assert request.environ.get('HTTP_X_PARTIAL_XHR')
         pull_request = PullRequest.get_or_404(pull_request_id)
 
         status = request.POST.get('changeset_status')
@@ -698,9 +699,6 @@ class PullrequestsController(BaseRepoCon
 
         Session().commit()
 
-        if not request.environ.get('HTTP_X_PARTIAL_XHR'):
-            raise HTTPFound(location=pull_request.url())
-
         data = {
            'target_id': h.safeid(h.safe_unicode(request.POST.get('f_path'))),
         }