From d9b5680a4596d55265ef57acfae2606880a2996c Mon Sep 17 00:00:00 2001
From: Tudor Timi <tudortimi@users.noreply.github.com>
Date: Wed, 3 May 2023 23:04:18 +0200
Subject: [PATCH] Fix crash caused by $display() optimization (#4165) (#4166)

---
 docs/CONTRIBUTORS | 1 +
 src/V3Const.cpp   | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/CONTRIBUTORS b/docs/CONTRIBUTORS
index 9ca29b828..85fcb791f 100644
--- a/docs/CONTRIBUTORS
+++ b/docs/CONTRIBUTORS
@@ -146,6 +146,7 @@ Todd Strader
 Tomasz Gorochowik
 Topa Topino
 Toru Niina
+Tudor Timi
 Tymoteusz Blazejczyk
 Udi Finkelstein
 Unai Martinez-Corral
diff --git a/src/V3Const.cpp b/src/V3Const.cpp
index 47f1a4b05..934307192 100644
--- a/src/V3Const.cpp
+++ b/src/V3Const.cpp
@@ -3064,7 +3064,7 @@ private:
                   && nodep->displayType() == VDisplayType::DT_WRITE)))
             return false;
         if ((prevp->filep() && !nodep->filep()) || (!prevp->filep() && nodep->filep())
-            || !prevp->filep()->sameTree(nodep->filep()))
+            || (prevp->filep() && nodep->filep() && !prevp->filep()->sameTree(nodep->filep())))
             return false;
         if (!prevp->fmtp() || prevp->fmtp()->nextp() || !nodep->fmtp() || nodep->fmtp()->nextp())
             return false;