From 616d587c2f9a6c79da57aca29a0d56e1f5521e10 Mon Sep 17 00:00:00 2001
From: Pino Toscano <pino@kde.org>
Date: Fri, 2 Nov 2007 20:21:53 +0000
Subject: [PATCH] don't crash when trying to mapping an invalid proxy index in
 the group proxy model

svn path=/trunk/KDE/kdegraphics/okular/; revision=732110
---
 ui/annotationproxymodels.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ui/annotationproxymodels.cpp b/ui/annotationproxymodels.cpp
index 00b2d08f9..f2c08fe08 100644
--- a/ui/annotationproxymodels.cpp
+++ b/ui/annotationproxymodels.cpp
@@ -137,6 +137,9 @@ QModelIndex PageGroupProxyModel::mapFromSource( const QModelIndex &sourceIndex )
 
 QModelIndex PageGroupProxyModel::mapToSource( const QModelIndex &proxyIndex ) const
 {
+  if ( !proxyIndex.isValid() )
+    return QModelIndex();
+
   if ( mGroupByPage ) {
     if ( proxyIndex.internalId() == 0 ) {