From 6e6415f6e25deb9e15d3d7eb9e2776f4a15c68b3 Mon Sep 17 00:00:00 2001
From: James Cherry <cherry@parallaxsw.com>
Date: Wed, 27 May 2020 20:24:01 -0700
Subject: [PATCH] RequiredVisitor::visitFromToPath to_tag_group null check

---
 search/Search.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/search/Search.cc b/search/Search.cc
index 9c468452..6bd96bac 100644
--- a/search/Search.cc
+++ b/search/Search.cc
@@ -3445,7 +3445,7 @@ RequiredVisitor::visitFromToPath(const Pin *,
     const MinMax *req_min = min_max->opposite();
     TagGroup *to_tag_group = sta_->search()->tagGroup(to_vertex);
     // Check to see if to_tag was pruned.
-    if (to_tag_group->hasTag(to_tag)) {
+    if (to_tag_group && to_tag_group->hasTag(to_tag)) {
       PathVertex to_path(to_vertex, to_tag, sta_);
       Required to_required = to_path.required(sta_);
       Required from_required = to_required - arc_delay;