diff --git a/StreamingKit/StreamingKit/STKAudioPlayer.m b/StreamingKit/StreamingKit/STKAudioPlayer.m
index adc8663..7e3a4e4 100644
--- a/StreamingKit/StreamingKit/STKAudioPlayer.m
+++ b/StreamingKit/StreamingKit/STKAudioPlayer.m
@@ -530,7 +530,12 @@ static void AudioFileStreamPacketsProc(void* clientData, UInt32 numberBytes, UIn
     {
         currentlyPlayingEntry.dataSource.delegate = nil;
         [currentlyReadingEntry.dataSource unregisterForEvents];
+        
+        OSSpinLockLock(&currentEntryReferencesLock);
+        
 		currentlyPlayingEntry = nil;
+        
+        OSSpinLockUnlock(&currentEntryReferencesLock);
     }
     
     [self stopAudioUnitWithReason:STKAudioPlayerStopReasonDisposed];
@@ -928,20 +933,15 @@ static void AudioFileStreamPacketsProc(void* clientData, UInt32 numberBytes, UIn
     }
     
     OSSpinLockLock(&currentEntryReferencesLock);
-    
     STKQueueEntry* entry = currentlyPlayingEntry;
+	OSSpinLockUnlock(&currentEntryReferencesLock);
     
     if (entry == nil)
     {
-		OSSpinLockUnlock(&currentEntryReferencesLock);
-        
-        return 0;
+		return 0;
     }
     
     double retval = [entry duration];
-    
-	OSSpinLockUnlock(&currentEntryReferencesLock);
-    
     double progress = [self progress];
     
     if (retval < progress && retval > 0)
@@ -964,7 +964,9 @@ static void AudioFileStreamPacketsProc(void* clientData, UInt32 numberBytes, UIn
         return 0;
     }
     
+    OSSpinLockLock(&currentEntryReferencesLock);
     STKQueueEntry* entry = currentlyPlayingEntry;
+    OSSpinLockUnlock(&currentEntryReferencesLock);
     
     if (entry == nil)
     {
diff --git a/StreamingKit/StreamingKit/STKQueueEntry.m b/StreamingKit/StreamingKit/STKQueueEntry.m
index 1e27973..2b6de04 100644
--- a/StreamingKit/StreamingKit/STKQueueEntry.m
+++ b/StreamingKit/StreamingKit/STKQueueEntry.m
@@ -18,6 +18,8 @@
 {
     if (self = [super init])
     {
+        self->spinLock = OS_SPINLOCK_INIT;
+        
         self.dataSource = dataSourceIn;
         self.queueItemId = queueItemIdIn;
         self->lastFrameQueued = -1;