From 77f47b6e47726207b8d634ed941efa59014c72a0 Mon Sep 17 00:00:00 2001
From: jean-pierre charras <jp.charras@wanadoo.fr>
Date: Sun, 26 Sep 2021 10:54:50 +0200
Subject: [PATCH] Avoid assertion in some cases.

---
 pcbnew/tools/drawing_stackup_table_tool.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pcbnew/tools/drawing_stackup_table_tool.cpp b/pcbnew/tools/drawing_stackup_table_tool.cpp
index 6c1dcb560f..652b540d2d 100644
--- a/pcbnew/tools/drawing_stackup_table_tool.cpp
+++ b/pcbnew/tools/drawing_stackup_table_tool.cpp
@@ -305,7 +305,10 @@ std::vector<BOARD_ITEM*> DRAWING_TOOL::DrawSpecificationStackup( const wxPoint&
             // In this case, for dielectric, a dummy name will be used
             if( stackup_item->GetLayerName().IsEmpty() )
             {
-                wxString ly_name = m_frame->GetBoard()->GetLayerName( stackup_item->GetBrdLayerId() );
+                wxString ly_name;
+
+                if( IsValidLayer( stackup_item->GetBrdLayerId() ) )
+                    ly_name = m_frame->GetBoard()->GetLayerName( stackup_item->GetBrdLayerId() );
 
                 if( ly_name.IsEmpty() && stackup_item->GetType() == BS_ITEM_TYPE_DIELECTRIC )
                    ly_name = _( "Dielectric" );