diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 95cf28ec49346e500d00c1bcac9dc6f4055a0eb4..727ca9ad7f3a50442eb5a4eb461deda1ff283b32 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -2057,6 +2057,8 @@ SSqlObj* createSubqueryObj(SSqlObj* pSql, int16_t tableIndex, __async_cb_func_t
   pnCmd->parseFinished = 1;
   pnCmd->pTableNameList = NULL;
   pnCmd->pTableBlockHashList = NULL;
+  pnCmd->tagData.data = NULL;
+  pnCmd->tagData.dataLen = 0;
 
   if (tscAddSubqueryInfo(pnCmd) != TSDB_CODE_SUCCESS) {
     terrno = TSDB_CODE_TSC_OUT_OF_MEMORY;