From a80141f9f118d99c4202a5b8738951757b1dd2dc Mon Sep 17 00:00:00 2001
From: unknown <zhangxl@jiedaibao.com>
Date: Thu, 4 Jan 2018 10:00:04 +0800
Subject: [PATCH] =?UTF-8?q?func=E4=B8=BA=E7=A9=BA=E4=BC=9A=E5=AF=BC?=
 =?UTF-8?q?=E8=87=B4judge=E6=9C=8D=E5=8A=A1crash?=
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---
 modules/judge/store/func.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/judge/store/func.go b/modules/judge/store/func.go
index 3eee1d372..28466e8c8 100644
--- a/modules/judge/store/func.go
+++ b/modules/judge/store/func.go
@@ -263,6 +263,9 @@ func atois(s string) (ret []int, err error) {
 
 // @str: e.g. all(#3) sum(#3) avg(#10) diff(#10)
 func ParseFuncFromString(str string, operator string, rightValue float64) (fn Function, err error) {
+	if str == "" {
+		return nil, fmt.Errorf("func con't be nil!")
+	}
 	idx := strings.Index(str, "#")
 	args, err := atois(str[idx+1 : len(str)-1])
 	if err != nil {