diff --git a/src/main/java/com/github/jie65535/opencommand/EventListeners.java b/src/main/java/com/github/jie65535/opencommand/EventListeners.java
index fa41be9..fc3a40a 100644
--- a/src/main/java/com/github/jie65535/opencommand/EventListeners.java
+++ b/src/main/java/com/github/jie65535/opencommand/EventListeners.java
@@ -44,13 +44,11 @@ public final class EventListeners {
      * @param uid 玩家uid
      * @return 新的玩家消息处理类
      */
-    public static StringBuilder getPlayerNewMessageHandler(int uid) {
+    public static StringBuilder getPlayerMessageHandler(int uid) {
         var handler = playerMessageHandlers.get(uid);
         if (handler == null) {
             handler = new StringBuilder();
             playerMessageHandlers.put(uid, handler);
-        } else {
-            handler.setLength(0);
         }
         return handler;
     }
diff --git a/src/main/java/com/github/jie65535/opencommand/OpenCommandHandler.java b/src/main/java/com/github/jie65535/opencommand/OpenCommandHandler.java
index 9f8595b..5288363 100644
--- a/src/main/java/com/github/jie65535/opencommand/OpenCommandHandler.java
+++ b/src/main/java/com/github/jie65535/opencommand/OpenCommandHandler.java
@@ -152,11 +152,12 @@ public final class OpenCommandHandler implements Router {
                         context.json(new JsonResponse(404, "Player not found"));
                         return;
                     }
+                    // Player MessageHandler do not support concurrency
+                    var handler = EventListeners.getPlayerMessageHandler(player.getUid());
                     //noinspection SynchronizationOnLocalVariableOrMethodParameter
-                    synchronized (player) {
-                        // Player MessageHandler do not support concurrency
-                        var handler = EventListeners.getPlayerNewMessageHandler(player.getUid());
+                    synchronized (handler) {
                         try {
+                            handler.setLength(0);
                             CommandMap.getInstance().invoke(player, player, command);
                             context.json(new JsonResponse(handler.toString()));
                         } catch (Exception e) {
diff --git a/src/main/java/com/github/jie65535/opencommand/socket/SocketClient.java b/src/main/java/com/github/jie65535/opencommand/socket/SocketClient.java
index 4c9e0b2..e32cebd 100644
--- a/src/main/java/com/github/jie65535/opencommand/socket/SocketClient.java
+++ b/src/main/java/com/github/jie65535/opencommand/socket/SocketClient.java
@@ -159,11 +159,12 @@ public class SocketClient {
                                         sendPacket(new HttpPacket(404, "Player not found."), packet.packetID);
                                         return;
                                     }
+                                    // Player MessageHandler do not support concurrency
+                                    var handler = EventListeners.getPlayerMessageHandler(playerData.getUid());
                                     //noinspection SynchronizationOnLocalVariableOrMethodParameter
-                                    synchronized (playerData) {
-                                        // Player MessageHandler do not support concurrency
-                                        var handler = EventListeners.getPlayerNewMessageHandler(playerData.getUid());
+                                    synchronized (handler) {
                                         try {
+                                            handler.setLength(0);
                                             CommandMap.getInstance().invoke(playerData, playerData, command);
                                             sendPacket(new HttpPacket(200, handler.toString()), packet.packetID);
                                         } catch (Exception e) {