From c5e9ac7590d39e6928add8559ed8ff44434a2ad7 Mon Sep 17 00:00:00 2001
From: r3inbowari <r3inbowari@gmail.com>
Date: Sat, 11 Nov 2023 22:21:51 +0800
Subject: [PATCH] fix: unexpected division by a zero-length vector in
 stddeviation

---
 speedtest/request.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/speedtest/request.go b/speedtest/request.go
index b9020e3..661514c 100644
--- a/speedtest/request.go
+++ b/speedtest/request.go
@@ -387,6 +387,9 @@ func checkSum(data []byte) uint16 {
 }
 
 func StandardDeviation(vector []int64) (mean, variance, stdDev, min, max int64) {
+	if len(vector) == 0 {
+		return
+	}
 	var sumNum, accumulate int64
 	min = math.MaxInt64
 	max = math.MinInt64