From a56c02e94bf43a0fb5125067c051f4788994fdba Mon Sep 17 00:00:00 2001
From: charras <Unknown>
Date: Mon, 8 Jun 2009 18:10:40 +0000
Subject: [PATCH] change for macOSX compatibility

---
 eeschema/schframe.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/eeschema/schframe.cpp b/eeschema/schframe.cpp
index 7a8d67fc4a..8991ce2215 100644
--- a/eeschema/schframe.cpp
+++ b/eeschema/schframe.cpp
@@ -428,12 +428,14 @@ void WinEDA_SchematicFrame::OnUpdatePaste( wxUpdateUIEvent& event )
 
 void WinEDA_SchematicFrame::OnUpdateSchematicUndo( wxUpdateUIEvent& event )
 {
-    event.Enable( (GetScreen()->m_UndoList) ? true : false );
+    if ( GetScreen() )
+        event.Enable( (GetScreen()->m_UndoList) ? true : false );
 }
 
 void WinEDA_SchematicFrame::OnUpdateSchematicRedo( wxUpdateUIEvent& event )
 {
-    event.Enable( (GetScreen()->m_RedoList) ? true : false );
+    if ( GetScreen() )
+        event.Enable( (GetScreen()->m_RedoList) ? true : false );
 }
 
 void WinEDA_SchematicFrame::OnUpdateBusOrientation( wxUpdateUIEvent& event )