diff --git a/source/libs/planner/src/planSpliter.c b/source/libs/planner/src/planSpliter.c
index 249ba1815de6067274d2cdd6a5d8782cfcd47d66..489046d88e73219fda229b6a2329096fd55d8f8f 100644
--- a/source/libs/planner/src/planSpliter.c
+++ b/source/libs/planner/src/planSpliter.c
@@ -596,6 +596,7 @@ static int32_t stbSplSplitSessionForStream(SSplitContext* pCxt, SStableSplitInfo
     int32_t index = 0;
     int32_t code = stbSplAppendWEnd(pPartWin, &index);
     if (TSDB_CODE_SUCCESS == code) {
+      nodesDestroyNode(pMergeWin->pTsEnd);
       pMergeWin->pTsEnd = nodesCloneNode(nodesListGetNode(pPartWin->node.pTargets, index));
       if (NULL == pMergeWin->pTsEnd) {
         code = TSDB_CODE_OUT_OF_MEMORY;