diff --git a/src/server/GoUtil/mathUtil.go b/src/server/GoUtil/mathUtil.go
index d2f17d6a..709ff822 100644
--- a/src/server/GoUtil/mathUtil.go
+++ b/src/server/GoUtil/mathUtil.go
@@ -4,5 +4,8 @@ func RandNum(start int, end int) int {
 	if start > end {
 		return 0
 	}
+	if start == end {
+		return start
+	}
 	return start + GetRand().Intn(end-start+1)
 }