From 50b7027b2243184bd58a17a5c839942144ba7586 Mon Sep 17 00:00:00 2001
From: Seth Hillbrand <hillbrand@ucdavis.edu>
Date: Mon, 5 Aug 2019 20:00:36 -0700
Subject: [PATCH] gerbview: Don't use worksheet items as GERBER_DRAW items

The static cast caught items that don't have the GetLayerPolarity
function (worksheet view)
---
 gerbview/gerbview_frame.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gerbview/gerbview_frame.cpp b/gerbview/gerbview_frame.cpp
index 54ba5f76f4..82380b2618 100644
--- a/gerbview/gerbview_frame.cpp
+++ b/gerbview/gerbview_frame.cpp
@@ -443,10 +443,10 @@ void GERBVIEW_FRAME::SetElementVisibility( int aLayerID, bool aNewState )
 
         view->UpdateAllItemsConditionally( KIGFX::REPAINT, []( KIGFX::VIEW_ITEM* aItem )
         {
-            auto item = static_cast<GERBER_DRAW_ITEM*>( aItem );
+            auto item = dynamic_cast<GERBER_DRAW_ITEM*>( aItem );
 
             // GetLayerPolarity() returns true for negative items
-            return item->GetLayerPolarity();
+            return ( item && item->GetLayerPolarity() );
         } );
         break;
     }