diff --git a/modules/arena/api_info.go b/modules/arena/api_info.go
index db8af15ee..684aea6f1 100644
--- a/modules/arena/api_info.go
+++ b/modules/arena/api_info.go
@@ -94,7 +94,9 @@ func (this *apiComp) Info(session comm.IUserSession, req *pb.ArenaInfoReq) (errd
 			)
 			ids = make([]string, len(info.Defend.Formt))
 			for i, v := range info.Defend.Formt {
-				ids[i] = v.Id
+				if v != nil {
+					ids[i] = v.Id
+				}
 			}
 			if heros, err = this.module.modelArena.queryUserHeros(session.GetUserId(), ids); err != nil {
 				errdata = &pb.ErrorData{