From 6a9d94fd97eec570e15c15ce5e2b01848ee60b48 Mon Sep 17 00:00:00 2001
From: yihaoDeng <yhdeng@taosdata.com>
Date: Thu, 22 Jul 2021 14:38:08 +0800
Subject: [PATCH] [TD-5474]<fix> fix runtime bug

---
 src/plugins/http/src/httpGcJson.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/plugins/http/src/httpGcJson.c b/src/plugins/http/src/httpGcJson.c
index f33a994465..2d361d3794 100644
--- a/src/plugins/http/src/httpGcJson.c
+++ b/src/plugins/http/src/httpGcJson.c
@@ -199,7 +199,7 @@ bool gcBuildQueryJson(HttpContext *pContext, HttpSqlCmd *cmd, TAOS_RES *result,
 
     for (int32_t i = dataFields; i >= 0; i--) {
       httpJsonItemToken(jsonBuf);
-      if (row[i] == NULL) {
+      if (row == NULL || i >= num_fields || row[i] == NULL) {
         httpJsonOriginString(jsonBuf, "null", 4);
         continue;
       }