From 03f79f512c96c9cbc26a06371061fc1d9ee1e574 Mon Sep 17 00:00:00 2001
From: Jeff Young <jeff@rokeby.ie>
Date: Wed, 30 Nov 2022 13:56:23 +0000
Subject: [PATCH] Nullptr safety.

Fixes https://gitlab.com/kicad/code/kicad/issues/12966
---
 pcbnew/board.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/pcbnew/board.cpp b/pcbnew/board.cpp
index 782eaf6496..228b907c38 100644
--- a/pcbnew/board.cpp
+++ b/pcbnew/board.cpp
@@ -262,10 +262,13 @@ void BOARD::UpdateRatsnestExclusions()
     GetConnectivity()->RunOnUnconnectedEdges(
             [&]( CN_EDGE& aEdge )
             {
-                std::pair<KIID, KIID> ids = { aEdge.GetSourceNode()->Parent()->m_Uuid,
-                                              aEdge.GetTargetNode()->Parent()->m_Uuid };
+                if( aEdge.GetSourceNode() && aEdge.GetTargetNode() )
+                {
+                    std::pair<KIID, KIID> ids = { aEdge.GetSourceNode()->Parent()->m_Uuid,
+                                                  aEdge.GetTargetNode()->Parent()->m_Uuid };
 
-                aEdge.SetVisible( m_ratsnestExclusions.count( ids ) == 0 );
+                    aEdge.SetVisible( m_ratsnestExclusions.count( ids ) == 0 );
+                }
 
                 return true;
             } );