diff --git a/src/multimedia/effects/qsamplecache_p.cpp b/src/multimedia/effects/qsamplecache_p.cpp
index 69c8d66c..1a06cd17 100644
--- a/src/multimedia/effects/qsamplecache_p.cpp
+++ b/src/multimedia/effects/qsamplecache_p.cpp
@@ -282,8 +282,11 @@ void QSample::release()
 // must be called locked.
 void QSample::cleanup()
 {
-    m_waveDecoder->deleteLater();
-    m_stream->deleteLater();
+    if (m_waveDecoder)
+        m_waveDecoder->deleteLater();
+    if (m_stream)
+        m_stream->deleteLater();
+
     m_waveDecoder = 0;
     m_stream = 0;
 }