From 67f0c46b25646ee91148126d2c19ce2bbab9c512 Mon Sep 17 00:00:00 2001
From: Julian Blank <blankjul@msu.edu>
Date: Sun, 17 Dec 2023 13:07:27 -0800
Subject: [PATCH] SMSEMOA: variable 'pop' referenced before assignment in
 _advance function #513

---
 pymoo/algorithms/moo/sms.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pymoo/algorithms/moo/sms.py b/pymoo/algorithms/moo/sms.py
index 03e7d9c1..147cd8cc 100644
--- a/pymoo/algorithms/moo/sms.py
+++ b/pymoo/algorithms/moo/sms.py
@@ -184,6 +184,9 @@ def _advance(self, infills=None, **kwargs):
         # merge the offsprings with the current population
         if infills is not None:
             pop = Population.merge(self.pop, infills)
+        else:
+            pop = self.pop
+
 
         self.pop = self.survival.do(self.problem, pop, n_survive=self.pop_size, algorithm=self,
                                     ideal=ideal, nadir=nadir, **kwargs)