Crash with EXPLAIN + WITH + constant query

DROP TABLE IF EXISTS t1;

CREATE TABLE t1 (a INT);

INSERT INTO t1 VALUES (1),(2),(3);

SELECT * FROM (WITH a AS (SELECT * FROM t1) SELECT 1) AS t1;

EXPLAIN SELECT * FROM (WITH a AS (SELECT * FROM t1) SELECT 1) AS t1;

#0  0x0000555555a419a3 in st_select_lex::update_used_tables (this=0x7ffecf4612e0)

    at /home/bar/maria-git/server.10.2/sql/sql_lex.cc:4218

#1  0x0000555555a8bda7 in JOIN::optimize_inner (this=0x7ffecf4656f0)

    at /home/bar/maria-git/server.10.2/sql/sql_select.cc:1162

#2  0x0000555555a8b9b4 in JOIN::optimize (this=0x7ffecf4656f0) at /home/bar/maria-git/server.10.2/sql/sql_select.cc:1070

#3  0x0000555555a93cbf in mysql_select (thd=0x7ffecf416070, tables=0x7ffecf461ee0, wild_num=0, fields=..., conds=0x0, 

    og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2416184068, result=0x7ffecf4644d0, 

    unit=0x7ffecf461678, select_lex=0x7ffecf4612e0) at /home/bar/maria-git/server.10.2/sql/sql_select.cc:3524

#4  0x0000555555ac7a2b in mysql_explain_union (thd=0x7ffecf416070, unit=0x7ffecf461678, result=0x7ffecf4644d0)

    at /home/bar/maria-git/server.10.2/sql/sql_select.cc:24511

#5  0x0000555555ac77c7 in select_describe (join=0x7ffecf464b50, need_tmp_table=false, need_order=false, distinct=false, 

    message=0x0) at /home/bar/maria-git/server.10.2/sql/sql_select.cc:24466

#6  0x0000555555a935b9 in JOIN::exec_inner (this=0x7ffecf464b50)

    at /home/bar/maria-git/server.10.2/sql/sql_select.cc:3314

#7  0x0000555555a92c8a in JOIN::exec (this=0x7ffecf464b50) at /home/bar/maria-git/server.10.2/sql/sql_select.cc:3154

#8  0x0000555555a93d4f in mysql_select (thd=0x7ffecf416070, tables=0x7ffecf463e00, wild_num=1, fields=..., conds=0x0, 

    og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748612, result=0x7ffecf4644d0, 

    unit=0x7ffecf419ac0, select_lex=0x7ffecf41a1e8) at /home/bar/maria-git/server.10.2/sql/sql_select.cc:3538

#9  0x0000555555ac7a2b in mysql_explain_union (thd=0x7ffecf416070, unit=0x7ffecf419ac0, result=0x7ffecf4644d0)

    at /home/bar/maria-git/server.10.2/sql/sql_select.cc:24511