diff --git a/Tun/Punchnet/Actors/SDLContextActor.swift b/Tun/Punchnet/Actors/SDLContextActor.swift
index a59fdb9..346b2e3 100644
--- a/Tun/Punchnet/Actors/SDLContextActor.swift
+++ b/Tun/Punchnet/Actors/SDLContextActor.swift
@@ -172,7 +172,8 @@ actor SDLContextActor {
         quicClient.start()
         
         defer {
-            quicClient.stop()
+            self.quicClient?.stop()
+            self.quicClient = nil
             SDLLogger.log("[SDLContext] quicClient: stop")
         }
         
diff --git a/Tun/Punchnet/UDPHole/SDLUDPHole.swift b/Tun/Punchnet/UDPHole/SDLUDPHole.swift
index d258202..ea0f895 100644
--- a/Tun/Punchnet/UDPHole/SDLUDPHole.swift
+++ b/Tun/Punchnet/UDPHole/SDLUDPHole.swift
@@ -67,15 +67,14 @@ final class SDLUDPHole: ChannelInboundHandler {
     }
     
     // --MARK: ChannelInboundHandler delegate
-
+    
     func channelRead(context: ChannelHandlerContext, data: NIOAny) {
         let envelope = unwrapInboundIn(data)
         var buffer = envelope.data
         let remoteAddress = envelope.remoteAddress
         
-        if let rawBytes = buffer.getBytes(at: buffer.readerIndex, length: buffer.readableBytes) {
-            SDLLogger.log("[SDLUDPHole] get raw bytes: \(rawBytes.count), from: \(remoteAddress)", for: .debug)
-        }
+        let byteCount = buffer.readableBytes - buffer.readerIndex
+        SDLLogger.log("[SDLUDPHole] get raw bytes: \(byteCount), from: \(remoteAddress)", for: .debug)
         
         do {
             if let message = try SDLHoleMessage.decode(buffer: &buffer) {