From cc787830f3b869cbd6aa5118b3b0a5caae0c9da3 Mon Sep 17 00:00:00 2001
From: Paul Romano <paul.k.romano@gmail.com>
Date: Wed, 2 Dec 2020 16:25:19 -0600
Subject: [PATCH] Fix missing variable in tallies.py (thanks to @jlanversin).
 Closes #1727

---
 openmc/tallies.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/openmc/tallies.py b/openmc/tallies.py
index 646482ede9..048bd99513 100644
--- a/openmc/tallies.py
+++ b/openmc/tallies.py
@@ -354,7 +354,7 @@ class Tally(IDManagerMixin):
             if nuc in visited_nuclides:
                 msg = 'Unable to add a duplicate nuclide "{}" to Tally ID="{}" ' \
                       'since duplicate nuclides are not supported in the OpenMC ' \
-                      'Python API'.format(nuclide, self.id)
+                      'Python API'.format(nuc, self.id)
                 raise ValueError(msg)
             visited_nuclides.add(nuc)