diff --git a/cron/task/client.go b/cron/task/client.go
index d5a6188..fa7baa7 100644
--- a/cron/task/client.go
+++ b/cron/task/client.go
@@ -57,7 +57,7 @@ func (c networkClient) ClientOfflineNotify() {
 	for _, peer := range connectedPeers {
 		var clientName string
 		if !slices.ContainsFunc(clients, func(cli model.Client) bool {
-			isExist := peer.PublicKey.String() == jsoniter.Get([]byte(cli.Keys), "PublicKey").ToString()
+			isExist := peer.PublicKey.String() == jsoniter.Get([]byte(cli.Keys), "publicKey").ToString()
 			if isExist {
 				clientName = cli.Name
 			}