diff --git a/utils/common/any.hpp b/utils/common/any.hpp
index 63d05d3d2..5f7d6c0a5 100755
--- a/utils/common/any.hpp
+++ b/utils/common/any.hpp
@@ -45,6 +45,7 @@ namespace anyimpl
     {
         virtual void static_delete(void** x)
         {
+            *x = 0;
         }
         virtual void copy_from_value(void const* src, void** dest)
         {
diff --git a/utils/windowfunction/wf_udaf.cpp b/utils/windowfunction/wf_udaf.cpp
index eabd121db..5986c2872 100644
--- a/utils/windowfunction/wf_udaf.cpp
+++ b/utils/windowfunction/wf_udaf.cpp
@@ -708,6 +708,7 @@ void WF_udaf::operator()(int64_t b, int64_t e, int64_t c)
     mcsv1sdk::mcsv1_UDAF::ReturnCode rc;
     uint64_t colOut = fFieldIndex[0];
     bool isNull = false;
+    fValOut.reset();
 
     if ((fFrameUnit == WF__FRAME_ROWS) ||
             (fPrev == -1) ||