From f2e0af378fd2c87c71c5384020f37c4036f0cbd4 Mon Sep 17 00:00:00 2001
From: Patrick Shriwise <pshriwise@gmail.com>
Date: Tue, 29 Jun 2021 11:16:29 -0500
Subject: [PATCH] Addressing case where  is not present in surface HDF5 groups.

---
 openmc/surface.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/openmc/surface.py b/openmc/surface.py
index 70fd008318..b2f3c6710c 100644
--- a/openmc/surface.py
+++ b/openmc/surface.py
@@ -454,8 +454,8 @@ class Surface(IDManagerMixin, ABC):
         """
 
         # If this is a DAGMC surface, do nothing for now
-        geom_type = group['geom_type'][()].decode()
-        if geom_type == 'dagmc':
+        geom_type = group.get('geom_type')
+        if geom_type and geom_type[()].decode() == 'dagmc':
             return
 
         surface_id = int(group.name.split('/')[-1].lstrip('surface '))