From fbc8803c371ae8c3771ebc494b97d875d47c2c22 Mon Sep 17 00:00:00 2001
From: "Uwe L. Korn" <uwelk@xhochy.com>
Date: Wed, 26 Jun 2013 19:36:14 +0200
Subject: [PATCH] Don't try to acquire lock if we do not have a source anymore.

---
 src/libtomahawk/network/ControlConnection.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/libtomahawk/network/ControlConnection.cpp b/src/libtomahawk/network/ControlConnection.cpp
index 25596c327..36e701fb1 100644
--- a/src/libtomahawk/network/ControlConnection.cpp
+++ b/src/libtomahawk/network/ControlConnection.cpp
@@ -159,9 +159,15 @@ ControlConnection::registerSource()
 {
     Q_D( ControlConnection );
     QReadLocker sourceLocker( &d->sourceLock );
+    if ( d->source.isNull() )
+    {
+        // Not connected to a source anymore, nothing to do.
+        return;
+    }
+
     QSharedPointer<QMutexLocker> locker = d->source->acquireLock();
     // Only continue if we are still the ControlConnection associated with this source.
-    if ( !d->source.isNull() &&  d->source->controlConnection() == this )
+    if ( d->source->controlConnection() == this )
     {
         qDebug() << Q_FUNC_INFO << d->source->id();
         Source* source = (Source*) sender();