From affc62f09cdb66bd2fea9ffdf6b44099b1e0afde Mon Sep 17 00:00:00 2001
From: josh <josh@radiantnuclear.com>
Date: Wed, 4 Jan 2023 22:53:55 +0000
Subject: [PATCH] only reassign temps when not None

---
 openmc/cell.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/openmc/cell.py b/openmc/cell.py
index 8169ca4d2..cea362ed8 100644
--- a/openmc/cell.py
+++ b/openmc/cell.py
@@ -520,8 +520,9 @@ class Cell(IDManagerMixin):
 
             clone = openmc.Cell()
             clone.name = self.name
-            clone.temperature = self.temperature
             clone.volume = self.volume
+            if self.temperature is not None:
+                clone.temperature = self.temperature
             if self.translation is not None:
                 clone.translation = self.translation
             if self.rotation is not None: