diff --git a/modules/mainline/model_mainline.go b/modules/mainline/model_mainline.go
index 8ccd3d6a5..265e4df4c 100644
--- a/modules/mainline/model_mainline.go
+++ b/modules/mainline/model_mainline.go
@@ -178,6 +178,9 @@ func (this *ModelMline) randomboos(data *pb.DBMainline) (err error) {
 				}
 			}
 		}
+		if !ok {
+			continue
+		}
 		chapters = append(chapters, k)
 	}
 	if len(chapters) == 0 {