diff --git a/mysql-test/r/group_min_max.result b/mysql-test/r/group_min_max.result
index 5982931e677..846e8ece656 100644
--- a/mysql-test/r/group_min_max.result
+++ b/mysql-test/r/group_min_max.result
@@ -2353,3 +2353,30 @@ a	MIN(b)	MAX(b)	AVG(b)
 2	1	3	2.0000
 1	1	3	2.0000
 DROP TABLE t1;
+create table t1 (a int, b int, primary key (a,b), key `index` (a,b)) engine=MyISAM;
+insert into  t1 (a,b) values (0,0),(0,1),(0,2),(0,3),(0,4),(0,5),(0,6),(0,7),
+(0,8),(0,9),(0,10),(0,11),(0,12),(0,13);
+insert into t1 (a,b) select a, max(b)+1 from t1 where a = 0 group by a;
+select * from t1;
+a	b
+0	0
+0	1
+0	2
+0	3
+0	4
+0	5
+0	6
+0	7
+0	8
+0	9
+0	10
+0	11
+0	12
+0	13
+0	14
+explain extended select sql_buffer_result a, max(b)+1 from t1 where a = 0 group by a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	PRIMARY,index	PRIMARY	4	NULL	6	Using where; Using index for group-by; Using temporary
+Warnings:
+Note	1003	select sql_buffer_result `test`.`t1`.`a` AS `a`,(max(`test`.`t1`.`b`) + 1) AS `max(b)+1` from `test`.`t1` where (`test`.`t1`.`a` = 0) group by `test`.`t1`.`a`
+drop table t1;
diff --git a/mysql-test/t/group_min_max.test b/mysql-test/t/group_min_max.test
index 7f2607b513d..196dd3379f9 100644
--- a/mysql-test/t/group_min_max.test
+++ b/mysql-test/t/group_min_max.test
@@ -916,3 +916,15 @@ SELECT a, MIN(b), MAX(b), AVG(b) FROM t1 GROUP BY a ORDER BY a DESC;
 SELECT a, MIN(b), MAX(b), AVG(b) FROM t1 GROUP BY a ORDER BY a DESC;
 
 DROP TABLE t1;
+
+#
+# Bug#38195: Incorrect handling of aggregate functions when loose index scan is
+#            used causes server crash.
+#
+create table t1 (a int, b int, primary key (a,b), key `index` (a,b)) engine=MyISAM;
+insert into  t1 (a,b) values (0,0),(0,1),(0,2),(0,3),(0,4),(0,5),(0,6),(0,7),
+(0,8),(0,9),(0,10),(0,11),(0,12),(0,13);
+insert into t1 (a,b) select a, max(b)+1 from t1 where a = 0 group by a;
+select * from t1;
+explain extended select sql_buffer_result a, max(b)+1 from t1 where a = 0 group by a;
+drop table t1;
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 6de4b296d34..6928effc1a5 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -1724,7 +1724,8 @@ JOIN::exec()
     if (!items1)
     {
       items1= items0 + all_fields.elements;
-      if (sort_and_group || curr_tmp_table->group)
+      if (sort_and_group || curr_tmp_table->group ||
+          tmp_table_param.precomputed_group_by)
       {
 	if (change_to_use_tmp_fields(thd, items1,
 				     tmp_fields_list1, tmp_all_fields1,
@@ -9259,6 +9260,8 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
   MI_COLUMNDEF *recinfo;
   uint total_uneven_bit_length= 0;
   bool force_copy_fields= param->force_copy_fields;
+  /* Treat sum functions as normal ones when loose index scan is used. */
+  save_sum_fields|= param->precomputed_group_by;
   DBUG_ENTER("create_tmp_table");
   DBUG_PRINT("enter",("distinct: %d  save_sum_fields: %d  rows_limit: %lu  group: %d",
 		      (int) distinct, (int) save_sum_fields,