From 5cf328fbecfda9ea2cb2d2558410165138f970a0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20L=C3=BCbking?= <thomas.luebking@gmail.com>
Date: Tue, 2 Jul 2013 12:45:01 +0200
Subject: [PATCH] ensure to not add NULL effect windows to stacking

happens during threaded startup and crashes in blur effect
when initially enabled

REVIEW: 111360
---
 effects.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/effects.cpp b/effects.cpp
index da48338ecb..a81dfa1e66 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -1045,8 +1045,10 @@ EffectWindowList EffectsHandlerImpl::stackingOrder() const
 {
     ToplevelList list = Workspace::self()->xStackingOrder();
     EffectWindowList ret;
-    foreach (Toplevel *w, list)
-        ret.append(effectWindow(w));
+    foreach (Toplevel *t, list) {
+        if (EffectWindow *w = effectWindow(t))
+            ret.append(w);
+    }
     return ret;
 }