diff --git a/service/shellService.go b/service/shellService.go
index 430c7dd..fd5cb70 100644
--- a/service/shellService.go
+++ b/service/shellService.go
@@ -92,7 +92,12 @@ func GetShellWillRunFromMaster(server string) ([]dao.Shell, error) {
 	url := "https://" + master + "/shell/server_will_run_list?super_id=1"
 	var req proto.SyncUserShellReq
 	req.Server = server
-	req.Token = worker.GetRedisSetMembers("super_permission_tokens")[0]
+	superPermissions := worker.GetRedisSetMembers("super_permission_tokens")
+	if len(superPermissions) == 0 {
+		log.Println("no super permission tokens found, please check the configuration or redis")
+		return nil, errors.New("no super permission tokens found")
+	}
+	req.Token = superPermissions[0]
 	shells, err := worker.SyncDataFromMasterShellReq2(url, req)
 	if err != nil {
 		return nil, err