From 89ec0b63aa1f98a8ae69e348679a05726a0d3a60 Mon Sep 17 00:00:00 2001
From: Philipp Knechtges <philipp-dev@knechtges.com>
Date: Wed, 15 Jun 2011 19:34:12 +0200
Subject: [PATCH] kwin: Fix crash for Toplevel windows with zero EffectWindow

While closing a window it might happen that we emit the windowOpacityChanged
signal although we dont have an EffectWindow.
Related to commit 1ce3f9fc53aa93a7536d43d0c936266f0ae21b65
---
 effects.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/effects.cpp b/effects.cpp
index e5af332b7b..92c34b2cdb 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -351,7 +351,7 @@ void EffectsHandlerImpl::slotClientStepUserMovedResized(Client* c, const QRect&
 
 void EffectsHandlerImpl::slotOpacityChanged(Toplevel *t, qreal oldOpacity)
 {
-    if (t->opacity() == oldOpacity) {
+    if (t->opacity() == oldOpacity || !t->effectWindow()) {
         return;
     }
     emit windowOpacityChanged(t->effectWindow(), oldOpacity, (qreal)t->opacity());