Server crashes in ha_myisammrg::add_children_list upon CREATE OR REPLACE with MERGE

--source include/have_log_bin.inc

--source include/have_binlog_format_row.inc

CREATE TABLE t (a INT) ENGINE=MyISAM;

CREATE TEMPORARY TABLE tm (a INT) ENGINE=MERGE UNION=(t);

CREATE OR REPLACE TABLE tt LIKE tm;

# Cleanup

DROP TABLE tt, tm, t;

#3  <signal handler called>

#4  0x000055f081ca72a0 in ha_myisammrg::add_children_list (this=0x61b00003dbb8) at /data/src/bb-10.11-midenok/storage/myisammrg/ha_myisammrg.cc:466

#5  0x000055f081cae845 in ha_myisammrg::extra (this=0x61b00003dbb8, operation=HA_EXTRA_ADD_CHILDREN_LIST) at /data/src/bb-10.11-midenok/storage/myisammrg/ha_myisammrg.cc:1335

#6  0x000055f0801dcf1e in mysql_create_like_table (thd=0x62c0000c0218, table=0x6290000e83c8, src_table=0x6290000e6af0, create_info=0x7f35fdaae7f0) at /data/src/bb-10.11-midenok/sql/sql_table.cc:5942

#7  0x000055f0802107a2 in Sql_cmd_create_table_like::execute (this=0x6290000e62f0, thd=0x62c0000c0218) at /data/src/bb-10.11-midenok/sql/sql_table.cc:12817

#8  0x000055f07ff1c392 in mysql_execute_command (thd=0x62c0000c0218, is_called_from_prepared_stmt=false) at /data/src/bb-10.11-midenok/sql/sql_parse.cc:5997

#9  0x000055f07ff29692 in mysql_parse (thd=0x62c0000c0218, rawbuf=0x6290000e6238 "CREATE OR REPLACE TABLE tt LIKE tm", length=34, parser_state=0x7f35fdaafa90) at /data/src/bb-10.11-midenok/sql/sql_parse.cc:8023

#10 0x000055f07feffde4 in dispatch_command (command=COM_QUERY, thd=0x62c0000c0218, packet=0x629000253219 "CREATE OR REPLACE TABLE tt LIKE tm", packet_length=34, blocking=true) at /data/src/bb-10.11-midenok/sql/sql_parse.cc:1894

#11 0x000055f07fefcbc8 in do_command (thd=0x62c0000c0218, blocking=true) at /data/src/bb-10.11-midenok/sql/sql_parse.cc:1407

#12 0x000055f0803a53d8 in do_handle_one_connection (connect=0x608000002638, put_in_cache=true) at /data/src/bb-10.11-midenok/sql/sql_connect.cc:1416

#13 0x000055f0803a4d6e in handle_one_connection (arg=0x6080000025b8) at /data/src/bb-10.11-midenok/sql/sql_connect.cc:1318

#14 0x000055f080f7f6d8 in pfs_spawn_thread (arg=0x617000005498) at /data/src/bb-10.11-midenok/storage/perfschema/pfs.cc:2201

#15 0x00007f36073a9ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

#16 0x00007f3606f98aef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95