--- a/rep/channel/REPServerSocketChannel.java	Fri Aug 29 13:35:49 2008 +0900
+++ b/rep/channel/REPServerSocketChannel.java	Fri Aug 29 13:40:29 2008 +0900
@@ -59,17 +59,20 @@
 		ss.configureBlocking(block);
 	}
 
+
+	public SelectionKey register(REPSelector sel, int ops, Object att) throws ClosedChannelException {
+		assert(!isSimulation);
+		REPSelector selector = sel;
+		if(sel!=null)
+			return selector.register(ss, ops, att);
+		else
+			return null;
+	}
+
 	@Override
 	public SocketChannel accept() throws IOException {
 		// TODO Auto-generated method stub
 		return null;
 	}
-	
-
-	public SelectionKey register(REPSelector sel, int ops, Object att) throws ClosedChannelException {
-		assert(!isSimulation);
-		REPSelector selector = sel;
-		return selector.register(ss, ops, att);
-	}
 
 }