diff --git a/modules/mainline/model_mainline.go b/modules/mainline/model_mainline.go
index d693e4ade..6ee1b1626 100644
--- a/modules/mainline/model_mainline.go
+++ b/modules/mainline/model_mainline.go
@@ -171,6 +171,9 @@ func (this *ModelMline) randomboos(data *pb.DBMainline) (err error) {
 	for k, _ := range data.Chapteraward {
 		chapters = append(chapters, k)
 	}
+	if len(chapters) == 0 {
+		return
+	}
 	for _, v := range chapters {
 		if conf, err = this.module.configure.GetMainChapterConf(v); err != nil {
 			return