diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index aaf0450da37657acc29a2e3ba68d3b6fb2f3e0d4..7a8be085ebb1a09fd522b7b1035e4bec56bed885 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -190,7 +190,8 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   SSqlRes* pRes = &pSql->res;
 
   int32_t code = TSDB_CODE_SUCCESS;
-  if (!pInfo->valid || errno == TSDB_CODE_TSC_SQL_SYNTAX_ERROR) {
+  if (!pInfo->valid || terrno == TSDB_CODE_TSC_SQL_SYNTAX_ERROR) {
+    terrno = TSDB_CODE_SUCCESS;  // clear the error number
     return tscSQLSyntaxErrMsg(tscGetErrorMsgPayload(pCmd), NULL, pInfo->pzErrMsg);
   }