From 51a74b53cb404f331c20cf687205d8fd8fd3588c Mon Sep 17 00:00:00 2001
From: jean-pierre charras <jp.charras@wanadoo.fr>
Date: Sat, 29 Sep 2018 12:58:18 +0200
Subject: [PATCH] Pcbnew: Crash after running external plugin Happens only in
 Opengl mode. So enforce controls in 3 group function: DrawGroup,
 ChangeGroupColor, ChangeGroupDepth.

Fixes: lp:1795044
https://bugs.launchpad.net/kicad/+bug/1795044
---
 common/gal/opengl/opengl_gal.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/common/gal/opengl/opengl_gal.cpp b/common/gal/opengl/opengl_gal.cpp
index e97462c29f..159d5a2f9c 100644
--- a/common/gal/opengl/opengl_gal.cpp
+++ b/common/gal/opengl/opengl_gal.cpp
@@ -1288,19 +1288,22 @@ void OPENGL_GAL::EndGroup()
 
 void OPENGL_GAL::DrawGroup( int aGroupNumber )
 {
-    cachedManager->DrawItem( *groups[aGroupNumber] );
+    if( groups[aGroupNumber] )
+        cachedManager->DrawItem( *groups[aGroupNumber] );
 }
 
 
 void OPENGL_GAL::ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor )
 {
-    cachedManager->ChangeItemColor( *groups[aGroupNumber], aNewColor );
+    if( groups[aGroupNumber] )
+        cachedManager->ChangeItemColor( *groups[aGroupNumber], aNewColor );
 }
 
 
 void OPENGL_GAL::ChangeGroupDepth( int aGroupNumber, int aDepth )
 {
-    cachedManager->ChangeItemDepth( *groups[aGroupNumber], aDepth );
+    if( groups[aGroupNumber] )
+        cachedManager->ChangeItemDepth( *groups[aGroupNumber], aDepth );
 }