diff --git a/modules/arena/api_challenge.go b/modules/arena/api_challenge.go
index cfdc6018a..b74063fbe 100644
--- a/modules/arena/api_challenge.go
+++ b/modules/arena/api_challenge.go
@@ -8,7 +8,7 @@ import (
 
 // 参数校验
 func (this *apiComp) ChallengeCheck(session comm.IUserSession, req *pb.ArenaChallengeReq) (errdata *pb.ErrorData) {
-	if (!req.Isai && req.Playerid == "") || (req.Isai && req.MformatId == 0) || req.Battle.Format == nil || len(req.Battle.Format) != 5 {
+	if (!req.Isai && req.Playerid == "") || (req.Isai && req.MformatId == 0) || req.Battle == nil || req.Battle.Format == nil || len(req.Battle.Format) != 5 {
 		errdata = &pb.ErrorData{
 			Code:  pb.ErrorCode_ReqParameterError,
 			Title: pb.ErrorCode_ReqParameterError.ToString(),