From 741f69084885e4c63e8ec01b00c626a51bdc155b Mon Sep 17 00:00:00 2001
From: Miodrag Milanovic <mmicko@gmail.com>
Date: Thu, 16 May 2024 11:52:01 +0200
Subject: [PATCH] fix

---
 himbaechel/uarch/ng-ultra/pack.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/himbaechel/uarch/ng-ultra/pack.cc b/himbaechel/uarch/ng-ultra/pack.cc
index becc93b5..210828a4 100644
--- a/himbaechel/uarch/ng-ultra/pack.cc
+++ b/himbaechel/uarch/ng-ultra/pack.cc
@@ -797,7 +797,7 @@ void NgUltraPacker::pack_xrf_input_and_output(CellInfo *xrf, IdString cluster, I
     NetInfo *net_out = nullptr;
     if (out_port != IdString()) {
         net_out = xrf->getPort(out_port);
-        if (net_out->users.entries()==0) {
+        if (net_out && net_out->users.entries()==0) {
             xrf->disconnectPort(out_port);
             net_out = nullptr;
         }