From 704b408da01ac9a85e89a906ee9c6922d7f4323e Mon Sep 17 00:00:00 2001
From: Alan Alpert <alan.alpert@nokia.com>
Date: Fri, 23 Sep 2011 13:24:35 +1000
Subject: [PATCH] Defensive Programming

Task-number: QTBUG-21623
Change-Id: Ib906e6b50041d4e72034d6828d4dc7c503ec7bb4
Reviewed-on: http://codereview.qt-project.org/5426
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Martin Jones <martin.jones@nokia.com>
---
 src/declarative/particles/qsgparticlesystem.cpp |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/src/declarative/particles/qsgparticlesystem.cpp b/src/declarative/particles/qsgparticlesystem.cpp
index 26c6d05..f886865 100644
--- a/src/declarative/particles/qsgparticlesystem.cpp
+++ b/src/declarative/particles/qsgparticlesystem.cpp
@@ -938,6 +938,9 @@ void QSGParticleSystem::particleStateChange(int idx)
 
 void QSGParticleSystem::moveGroups(QSGParticleData *d, int newGIdx)
 {
+    if (!d || newGIdx == d->group)
+        return;
+
     QSGParticleData* pd = newDatum(newGIdx, false, d->systemIndex);
     pd->clone(*d);
     finishNewDatum(pd);
-- 
1.7.2.5