diff --git a/internal/msggateway/client.go b/internal/msggateway/client.go
index 289d4e94d..889e5c456 100644
--- a/internal/msggateway/client.go
+++ b/internal/msggateway/client.go
@@ -101,12 +101,14 @@ func (c *Client) ResetClient(ctx *UserConnContext, conn LongConn, longConnServer
 	c.subUserIDs = make(map[string]struct{})
 }
 
-func (c *Client) pingHandler(_ string) error {
+func (c *Client) pingHandler(appData string) error {
 	if err := c.conn.SetReadDeadline(pongWait); err != nil {
 		return err
 	}
 
-	return c.writePongMsg()
+	log.ZDebug(c.ctx, "ping Handler Success.", "appData", appData)
+
+	return c.writePongMsg(appData)
 }
 
 func (c *Client) pongHandler(_ string) error {
@@ -161,7 +163,7 @@ func (c *Client) readMessage() {
 			return
 
 		case PingMessage:
-			err := c.writePongMsg()
+			err := c.writePongMsg("")
 			log.ZError(c.ctx, "writePongMsg", err)
 
 		case CloseMessage:
@@ -389,7 +391,7 @@ func (c *Client) writePingMsg() error {
 	return c.conn.WriteMessage(PingMessage, nil)
 }
 
-func (c *Client) writePongMsg() error {
+func (c *Client) writePongMsg(appData string) error {
 	if c.closed.Load() {
 		return nil
 	}
@@ -402,5 +404,5 @@ func (c *Client) writePongMsg() error {
 		return err
 	}
 
-	return c.conn.WriteMessage(PongMessage, nil)
+	return c.conn.WriteMessage(PongMessage, []byte(appData))
 }
diff --git a/pkg/common/storage/cache/redis/seq_conversation.go b/pkg/common/storage/cache/redis/seq_conversation.go
index 76cac2b02..fb8a547df 100644
--- a/pkg/common/storage/cache/redis/seq_conversation.go
+++ b/pkg/common/storage/cache/redis/seq_conversation.go
@@ -63,7 +63,7 @@ func (s *seqConversationCacheRedis) batchGetMaxSeq(ctx context.Context, keys []s
 	for i, key := range keys {
 		result[i] = pipe.HGet(ctx, key, "CURR")
 	}
-	if _, err := pipe.Exec(ctx); err != nil {
+	if _, err := pipe.Exec(ctx); err != nil && !errors.Is(err, redis.Nil) {
 		return errs.Wrap(err)
 	}
 	var notFoundKey []string
diff --git a/tools/seq/internal/main.go b/tools/seq/internal/main.go
index 5200ad5fe..7f021a90e 100644
--- a/tools/seq/internal/main.go
+++ b/tools/seq/internal/main.go
@@ -116,7 +116,7 @@ func Main(conf string, del time.Duration) error {
 		{
 			Prefix: MaxSeq,
 			GetSeq: cSeq.GetMaxSeq,
-			SetSeq: cSeq.SetMinSeq,
+			SetSeq: cSeq.SetMaxSeq,
 		},
 		{
 			Prefix: MinSeq,