diff --git a/mysql-test/main/win_sum.result b/mysql-test/main/win_sum.result
index a17c17845af..aa376ecf7ba 100644
--- a/mysql-test/main/win_sum.result
+++ b/mysql-test/main/win_sum.result
@@ -105,3 +105,12 @@ EXISTS (SELECT 1 ORDER BY 1+sum(2) OVER ())
 #
 # End of 10.4 tests
 #
+#
+# MDEV-32411 Item_sum arguments incorrectly reset to temp table fields which causes crash
+#
+CREATE TABLE t1 (a INT NOT NULL) ;
+INSERT INTO t1 VALUES (EXISTS(SELECT avg(3) OVER (ORDER BY COUNT(DISTINCT a, HEX(a)))));
+DROP TABLE t1;
+#
+# End of 10.5 tests
+#
diff --git a/mysql-test/main/win_sum.test b/mysql-test/main/win_sum.test
index 9800174f54c..d3924435949 100644
--- a/mysql-test/main/win_sum.test
+++ b/mysql-test/main/win_sum.test
@@ -57,3 +57,14 @@ SELECT EXISTS (SELECT 1 ORDER BY 1+sum(2) OVER ());
 --echo #
 --echo # End of 10.4 tests
 --echo #
+
+--echo #
+--echo # MDEV-32411 Item_sum arguments incorrectly reset to temp table fields which causes crash
+--echo #
+CREATE TABLE t1 (a INT NOT NULL) ;
+INSERT INTO t1 VALUES (EXISTS(SELECT avg(3) OVER (ORDER BY COUNT(DISTINCT a, HEX(a)))));
+DROP TABLE t1;
+
+--echo #
+--echo # End of 10.5 tests
+--echo #
diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index 3b3661004c1..0acf4595058 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -527,27 +527,6 @@ void Item_sum::fix_num_length_and_dec()
   max_length=float_length(decimals);
 }
 
-Item *Item_sum::get_tmp_table_item(THD *thd)
-{
-  Item_sum* sum_item= (Item_sum *) copy_or_same(thd);
-  if (sum_item && sum_item->result_field)	   // If not a const sum func
-  {
-    Field *result_field_tmp= sum_item->result_field;
-    for (uint i=0 ; i < sum_item->arg_count ; i++)
-    {
-      Item *arg= sum_item->args[i];
-      if (!arg->const_item())
-      {
-	if (arg->type() == Item::FIELD_ITEM)
-	  ((Item_field*) arg)->field= result_field_tmp++;
-	else
-	  sum_item->args[i]= new (thd->mem_root) Item_temptable_field(thd, result_field_tmp++);
-      }
-    }
-  }
-  return sum_item;
-}
-
 
 void Item_sum::update_used_tables ()
 {
diff --git a/sql/item_sum.h b/sql/item_sum.h
index 2ebe0b554fb..56a926c841d 100644
--- a/sql/item_sum.h
+++ b/sql/item_sum.h
@@ -521,7 +521,6 @@ public:
     aggregator_clear();
   }
   virtual void make_unique() { force_copy_fields= TRUE; }
-  Item *get_tmp_table_item(THD *thd) override;
   virtual Field *create_tmp_field(MEM_ROOT *root, bool group, TABLE *table);
   Field *create_tmp_field_ex(MEM_ROOT *root, TABLE *table, Tmp_field_src *src,
                              const Tmp_field_param *param) override