Set the queued index before enqueuing, not after.

ProtocolLib/src/com/comphenix/protocol/async/AsyncFilterManager.java

@@ -186,12 +186,13 @@ public class AsyncFilterManager implements AsynchronousManager {
 		if (asyncMarker.isQueued() || asyncMarker.isTransmitted())
 			throw new IllegalArgumentException("Cannot queue a packet that has already been queued.");
 		
+		asyncMarker.setQueuedSendingIndex(asyncMarker.getNewSendingIndex());
+		
 		// Start the process
 		getSendingQueue(syncPacket).enqueue(newEvent);
 		
 		// We know this is occuring on the main thread, so pass TRUE
 		getProcessingQueue(syncPacket).enqueue(newEvent, true);
-		asyncMarker.setQueuedSendingIndex(asyncMarker.getNewSendingIndex());
 	}
 	
 	@Override

ProtocolLib/src/com/comphenix/protocol/injector/ListenerInvoker.java

@@ -4,6 +4,11 @@ import net.minecraft.server.Packet;
 
 import com.comphenix.protocol.events.PacketEvent;
 
+/**
+ * Represents an object that initiate the packet listeners.
+ * 
+ * @author Kristian
+ */
 public interface ListenerInvoker {
 
 	/**