From 936c52e2631d1236f3f5dcaad05b66a7ebc41186 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <mgraesslin@kde.org>
Date: Mon, 9 Nov 2015 16:24:13 +0100
Subject: [PATCH] Check whether Cursor is valid before using from
 EffectsHandler mousePolling

During tear down Compositor and Effect system might be destroyed after
Cursor. Thus we need to ensure that we don't call into Cursor
unconditonally.
---
 effects.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/effects.cpp b/effects.cpp
index 53f4f5c251..5ccf94f6c8 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -769,12 +769,14 @@ void* EffectsHandlerImpl::getProxy(QString name)
 
 void EffectsHandlerImpl::startMousePolling()
 {
-    Cursor::self()->startMousePolling();
+    if (Cursor::self())
+        Cursor::self()->startMousePolling();
 }
 
 void EffectsHandlerImpl::stopMousePolling()
 {
-    Cursor::self()->stopMousePolling();
+    if (Cursor::self())
+        Cursor::self()->stopMousePolling();
 }
 
 bool EffectsHandlerImpl::hasKeyboardGrab() const