From 588533751b07d69a1940241ba6a144eb30ae4938 Mon Sep 17 00:00:00 2001
From: Varun Agrawal <varagrawal@gmail.com>
Date: Tue, 10 Dec 2024 14:10:33 -0500
Subject: [PATCH] add another pointer check

---
 gtsam/discrete/DiscreteFactorGraph.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gtsam/discrete/DiscreteFactorGraph.cpp b/gtsam/discrete/DiscreteFactorGraph.cpp
index ec6dac2fc..d0bf21047 100644
--- a/gtsam/discrete/DiscreteFactorGraph.cpp
+++ b/gtsam/discrete/DiscreteFactorGraph.cpp
@@ -76,7 +76,7 @@ namespace gtsam {
   double DiscreteFactorGraph::operator()(const DiscreteValues& values) const {
     double product = 1.0;
     for (const sharedFactor& factor : factors_) {
-      product *= (*factor)(values);
+      if (factor) product *= (*factor)(values);
     }
     return product;
   }