From d198dcbb88e2ff8a813270830e0869dcdde1e25d Mon Sep 17 00:00:00 2001
From: dapan1121 <89396746@qq.com>
Date: Fri, 11 Jun 2021 16:11:06 +0800
Subject: [PATCH] add null pointer check

---
 src/client/src/tscPrepare.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/client/src/tscPrepare.c b/src/client/src/tscPrepare.c
index 73e39b471b..38991e9f39 100644
--- a/src/client/src/tscPrepare.c
+++ b/src/client/src/tscPrepare.c
@@ -879,6 +879,11 @@ int taos_stmt_prepare(TAOS_STMT* stmt, const char* sql, unsigned long length) {
     return TSDB_CODE_TSC_DISCONNECTED;
   }
 
+  if (sql == NULL) {
+    tscError("sql is NULL");
+    return TSDB_CODE_TSC_APP_ERROR;
+  }
+
   SSqlObj* pSql = pStmt->pSql;
   size_t   sqlLen = strlen(sql);
 
-- 
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