From dde629330d9afef76ee340644281ae942cc5d4b9 Mon Sep 17 00:00:00 2001
From: jean-pierre charras <jp.charras@wanadoo.fr>
Date: Mon, 3 Jan 2022 15:10:13 +0100
Subject: [PATCH] Pcb plot: fixcrash due to a null pointer Fixes #10223
 https://gitlab.com/kicad/code/kicad/issues/10223

---
 pcbnew/plot_board_layers.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pcbnew/plot_board_layers.cpp b/pcbnew/plot_board_layers.cpp
index 1e19584603..0a9492a6e0 100644
--- a/pcbnew/plot_board_layers.cpp
+++ b/pcbnew/plot_board_layers.cpp
@@ -882,12 +882,13 @@ void PlotSolderMaskLayer( BOARD *aBoard, PLOTTER* aPlotter, LSET aLayerMask,
         for( const PCB_TRACK* track : aBoard->Tracks() )
         {
             const PCB_VIA* via = dyn_cast<const PCB_VIA*>( track );
-            int            clearance = via->GetSolderMaskExpansion();
 
             // Note: IsOnLayer() checks relevant mask layers of untented vias
             if( !via || !via->IsOnLayer( layer ) )
                 continue;
 
+            int            clearance = via->GetSolderMaskExpansion();
+
             // add shapes with their exact mask layer size in initialPolys
             via->TransformShapeWithClearanceToPolygon( initialPolys, layer, clearance, maxError,
                                                        ERROR_OUTSIDE );