diff --git a/modules/extent.go b/modules/extent.go
index 0b20a90..87583fd 100644
--- a/modules/extent.go
+++ b/modules/extent.go
@@ -400,6 +400,10 @@ func MakeMaX(cr *core.Core, cl *core.Candle, count int) (error, int) {
 	}
 	ljs, _ := json.Marshal(cdl.List)
 	fmt.Println("makeMax: ljs: ", string(ljs))
+	if len(cdl.List) < count {
+		err := errors.New("由于sortedSet容量有限，没有足够的元素数量来计算 maX, setName: " + setName + " ct: " + ToString(ct) + "count: " + ToString(count))
+		return err, int(float64(count) - ct)
+	}
 	for _, v := range cdl.List {
 		curLast, err := strconv.ParseFloat(v.Data[4].(string), 64)
 		if err != nil {