From 94130716a5ca1e1e754008426b202eaa4b231d7d Mon Sep 17 00:00:00 2001
From: Jon Evans <jon@craftyjon.com>
Date: Sun, 14 May 2023 17:20:59 -0400
Subject: [PATCH] PNS: Collision search context may be null

Fixes https://gitlab.com/kicad/code/kicad/-/issues/14741
---
 pcbnew/router/pns_item.cpp        |  3 ++-
 pcbnew/router/pns_line_placer.cpp | 18 ++++++++++++++----
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/pcbnew/router/pns_item.cpp b/pcbnew/router/pns_item.cpp
index 8d4297f926..eab515ca36 100644
--- a/pcbnew/router/pns_item.cpp
+++ b/pcbnew/router/pns_item.cpp
@@ -139,7 +139,8 @@ bool ITEM::collideSimple( const ITEM* aHead, const NODE* aNode,
     }
     else
     {
-        clearance = aNode->GetClearance( this, aHead, aCtx->options.m_useClearanceEpsilon );
+        clearance = aNode->GetClearance( this, aHead,
+                                         aCtx ? aCtx->options.m_useClearanceEpsilon : false );
     }
 
     if( clearance >= 0 )
diff --git a/pcbnew/router/pns_line_placer.cpp b/pcbnew/router/pns_line_placer.cpp
index 42da0e85d4..9d83c7087a 100644
--- a/pcbnew/router/pns_line_placer.cpp
+++ b/pcbnew/router/pns_line_placer.cpp
@@ -598,7 +598,9 @@ bool LINE_PLACER::rhWalkBase( const VECTOR2I& aP, LINE& aWalkLine, int aCollisio
 
         aViaOk = buildInitialLine( walkP, l1, round == 0 );
         PNS_DBG( Dbg(), AddItem, &l1, BLUE, 20000, wxT( "walk-base-l1" ) );
-        PNS_DBG( Dbg(), AddPoint, l1.Via().Pos(), BLUE, 100000, wxT( "walk-base-l1-via" ) );
+
+        if( l1.EndsWithVia() )
+            PNS_DBG( Dbg(), AddPoint, l1.Via().Pos(), BLUE, 100000, wxT( "walk-base-l1-via" ) );
 
         LINE initTrack( m_tail );
         initTrack.Line().Append( l1.CLine() );
@@ -731,7 +733,12 @@ bool LINE_PLACER::rhWalkBase( const VECTOR2I& aP, LINE& aWalkLine, int aCollisio
     }
 
     PNS_DBG( Dbg(), AddItem, &walkFull, GREEN, 200000, wxT( "walk-full" ) );
-    PNS_DBG( Dbg(), AddPoint, walkFull.Via().Pos(), GREEN, 200000, wxString::Format( "walk-via ok %d", aViaOk?1:0 ) );
+
+    if( walkFull.EndsWithVia() )
+    {
+        PNS_DBG( Dbg(), AddPoint, walkFull.Via().Pos(), GREEN, 200000,
+                 wxString::Format( "walk-via ok %d", aViaOk ? 1 : 0 ) );
+    }
 
     aWalkLine = walkFull;
 
@@ -987,8 +994,11 @@ bool LINE_PLACER::rhShoveOnly( const VECTOR2I& aP, LINE& aNewHead, LINE& aNewTai
 
         OPTIMIZER optimizer( m_currentNode );
 
-        PNS_DBG( Dbg(), AddPoint, newHead.Via().Pos(), GREEN, 1000000, "shove-via-preopt" );
-        PNS_DBG( Dbg(), AddPoint, newHead.Via().Pos(), GREEN, 1000000, "shove-via-postopt" );
+        if( newHead.EndsWithVia() )
+        {
+            PNS_DBG( Dbg(), AddPoint, newHead.Via().Pos(), GREEN, 1000000, "shove-via-preopt" );
+            PNS_DBG( Dbg(), AddPoint, newHead.Via().Pos(), GREEN, 1000000, "shove-via-postopt" );
+        }
 
         if( ! splitHeadTail( newHead, m_tail, aNewHead, aNewTail ) )
             return false;