From 65e66c4498eb78b9edf3779235996e479616d64d Mon Sep 17 00:00:00 2001
From: Peter Munch <peterrmuench@gmail.com>
Date: Thu, 26 Sep 2019 10:09:43 +0200
Subject: [PATCH] Fix a bug introduced in #8783

---
 source/distributed/tria_base.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/source/distributed/tria_base.cc b/source/distributed/tria_base.cc
index e2c91bfa8d..bad673e21e 100644
--- a/source/distributed/tria_base.cc
+++ b/source/distributed/tria_base.cc
@@ -394,6 +394,9 @@ namespace parallel
       // loop over all periodic face pairs
       for (const auto &pair : this->get_periodic_face_map())
         {
+          if (pair.first.first->level() != pair.second.first.first->level())
+            continue;
+
           const auto face_a = pair.first.first->face(pair.first.second);
           const auto face_b =
             pair.second.first.first->face(pair.second.first.second);
-- 
2.39.5