From 43ab963650180971e356dd587c1489ddd78854a3 Mon Sep 17 00:00:00 2001
From: Jeff Young <jeff@rokeby.ie>
Date: Wed, 16 Sep 2020 01:10:16 +0100
Subject: [PATCH] Don't expect footprint viewer frame to have a DRC engine.

---
 pcbnew/board_design_settings.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/pcbnew/board_design_settings.cpp b/pcbnew/board_design_settings.cpp
index 939e655e78..e5a8f6c820 100644
--- a/pcbnew/board_design_settings.cpp
+++ b/pcbnew/board_design_settings.cpp
@@ -934,8 +934,11 @@ int BOARD_DESIGN_SETTINGS::GetBiggestClearanceValue()
 {
     DRC_CONSTRAINT constraint;
 
-    m_DRCEngine->QueryWorstConstraint( DRC_CONSTRAINT_TYPE_CLEARANCE, constraint,
-                                       DRCCQ_LARGEST_MINIMUM );
+    if( m_DRCEngine )
+    {
+        m_DRCEngine->QueryWorstConstraint( DRC_CONSTRAINT_TYPE_CLEARANCE, constraint,
+                                           DRCCQ_LARGEST_MINIMUM );
+    }
 
     return constraint.Value().HasMin() ? constraint.Value().Min() : 0;
 }