From 359d66bc81cca324329e62145adecde9cf20130a Mon Sep 17 00:00:00 2001
From: Seth Hillbrand <seth@kipro-pcb.com>
Date: Thu, 16 Jun 2022 08:20:47 -0700
Subject: [PATCH] Protect against invalid pads

Before dereferencing the front of the sequence, we have to ensure that
the pad exists on any layer.  If not, just return the default (probably
F_Cu) for the element
---
 pcbnew/pad.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pcbnew/pad.cpp b/pcbnew/pad.cpp
index 655ebca699..49829b5053 100644
--- a/pcbnew/pad.cpp
+++ b/pcbnew/pad.cpp
@@ -209,10 +209,11 @@ PCB_LAYER_ID PAD::GetLayer() const
 
 PCB_LAYER_ID PAD::GetPrincipalLayer() const
 {
-    if( m_attribute == PAD_ATTRIB::SMD || m_attribute == PAD_ATTRIB::CONN )
+    if( m_attribute == PAD_ATTRIB::SMD || m_attribute == PAD_ATTRIB::CONN || GetLayerSet().none() )
         return m_layer;
     else
         return GetLayerSet().Seq().front();
+
 }