From d4cbc348de7ed40dfb2854e000eea80e31813dcb Mon Sep 17 00:00:00 2001
From: Seth Hillbrand <seth@kipro-pcb.com>
Date: Tue, 3 Mar 2020 13:45:07 -0800
Subject: [PATCH] PNS: avoid committing route with nothing

The node is not neccesarily populated when committing, so we need to
check for validity first.

Fixes #3984 | https://gitlab.com/kicad/code/kicad/issues/3984
---
 pcbnew/router/pns_line_placer.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pcbnew/router/pns_line_placer.cpp b/pcbnew/router/pns_line_placer.cpp
index 99827a52be..15d18d0ba1 100644
--- a/pcbnew/router/pns_line_placer.cpp
+++ b/pcbnew/router/pns_line_placer.cpp
@@ -1252,7 +1252,8 @@ bool LINE_PLACER::HasPlacedAnything() const
 
 bool LINE_PLACER::CommitPlacement()
 {
-    Router()->CommitRouting( m_lastNode );
+    if( m_lastNode )
+        Router()->CommitRouting( m_lastNode );
 
     m_lastNode = NULL;
     m_currentNode = NULL;