diff --git a/mysql-test/r/sp.result b/mysql-test/r/sp.result
index 47adafa93ba..08d69e102b4 100644
--- a/mysql-test/r/sp.result
+++ b/mysql-test/r/sp.result
@@ -8127,3 +8127,20 @@ v_name	v_total
 c	1
 DROP PROCEDURE p1;
 DROP TABLE t1;
+#
+# MDEV-13346: CURSOR a query with GROUP BY using derived table
+#
+CREATE PROCEDURE p1()
+BEGIN
+DECLARE c CURSOR FOR
+SELECT
+IFNULL(NULL,1) AS col
+FROM
+( select 1 as id ) AS t
+GROUP BY t.id
+;
+OPEN c;
+END
+|
+CALL p1();
+DROP PROCEDURE p1;
diff --git a/mysql-test/t/sp.test b/mysql-test/t/sp.test
index 3ca210d9904..eacc8cb6a1a 100644
--- a/mysql-test/t/sp.test
+++ b/mysql-test/t/sp.test
@@ -9588,3 +9588,25 @@ DELIMITER ;|
 CALL p1();
 DROP PROCEDURE p1;
 DROP TABLE t1;
+
+--echo #
+--echo # MDEV-13346: CURSOR a query with GROUP BY using derived table
+--echo #
+
+DELIMITER |;
+CREATE PROCEDURE p1()
+BEGIN
+  DECLARE c CURSOR FOR
+    SELECT
+      IFNULL(NULL,1) AS col
+    FROM
+      ( select 1 as id ) AS t
+    GROUP BY t.id
+  ;
+  OPEN c;
+END
+|
+DELIMITER ;|
+CALL p1();
+DROP PROCEDURE p1;
+
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index ba3760dd948..ce487205218 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -16572,7 +16572,12 @@ create_tmp_table(THD *thd, TMP_TABLE_PARAM *param, List<Item> &fields,
   Field **tmp_from_field=from_field;
   while ((item=li++))
   {
-    Item::Type type=item->type();
+    Item::Type type= item->type();
+    if (type == Item::COPY_STR_ITEM)
+    {
+      item= ((Item_copy *)item)->get_item();
+      type= item->type();
+    }
     if (not_all_columns)
     {
       if (item->with_sum_func && type != Item::SUM_FUNC_ITEM)