diff --git a/src/sql/engine/window_function/ob_window_function_op.cpp b/src/sql/engine/window_function/ob_window_function_op.cpp
index 5b89b38ade..ecf67c2853 100644
--- a/src/sql/engine/window_function/ob_window_function_op.cpp
+++ b/src/sql/engine/window_function/ob_window_function_op.cpp
@@ -1283,9 +1283,14 @@ int ObWindowFunctionOp::init()
             LOG_WARN("add func failed", K(ret));
           } else {
             LOG_DEBUG("add func succ", KPC(wf_cell));
+            wf_cell = NULL;
           }
         }
       }
+      if (OB_UNLIKELY(NULL != wf_cell)) {
+        wf_cell->~WinFuncCell();
+        wf_cell = NULL;
+      }
       if (OB_SUCC(ret) && MY_SPEC.is_participator()) {
         if (wf_info.can_push_down_) {
           if (common::OB_INVALID_COUNT == next_wf_pby_expr_cnt_to_transmit_) {