From 95ca28b7e8466e956898da377e253fc32c58e52d Mon Sep 17 00:00:00 2001
From: Andrew Reynolds <andrew.j.reynolds@gmail.com>
Date: Thu, 30 Jul 2020 09:54:57 -0500
Subject: Fix null case for sygus printing (#4793)

Avoids crashing on some of our debug traces.
---
 src/theory/quantifiers/sygus/term_database_sygus.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/theory/quantifiers/sygus/term_database_sygus.cpp b/src/theory/quantifiers/sygus/term_database_sygus.cpp
index ff1b172e9..ac10522a2 100644
--- a/src/theory/quantifiers/sygus/term_database_sygus.cpp
+++ b/src/theory/quantifiers/sygus/term_database_sygus.cpp
@@ -731,6 +731,11 @@ void TermDbSygus::toStreamSygus(const char* c, Node n)
 
 void TermDbSygus::toStreamSygus(std::ostream& out, Node n)
 {
+  if (n.isNull())
+  {
+    out << n;
+    return;
+  }
   // use external conversion
   out << datatypes::utils::sygusToBuiltin(n, true);
 }
-- 
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