Server crashes in GetTypeID / ha_connect::GetRealType upon altering table engine

--source include/have_innodb.inc

INSTALL SONAME 'ha_connect';

CREATE TABLE t (f INT) ENGINE=CONNECT;

ALTER TABLE t ENGINE InnoDB;

# Cleanup

DROP TABLE t;

UNINSTALL SONAME 'ha_connect';

#3  <signal handler called>

#4  __strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:270

#5  0x00007fa2ad4da34d in GetTypeID (type=0xa5a5a5a5a5a5a500 <error: Cannot access memory at address 0xa5a5a5a5a5a5a500>) at /data/src/10.5/storage/connect/mycat.cc:125

#6  0x00007fa2ad4bf274 in ha_connect::GetRealType (this=0x7fa288016428, pos=0x7fa2881aea28) at /data/src/10.5/storage/connect/ha_connect.cc:1056

#7  0x00007fa2ad4ca002 in ha_connect::check_privileges (this=0x7fa288016428, thd=0x7fa288000db8, options=0x7fa2881aea28, dbn=0x7fa2bcc4a560 "test", quick=false) at /data/src/10.5/storage/connect/ha_connect.cc:4479

#8  0x00007fa2ad4cbb85 in ha_connect::delete_or_rename_table (this=0x7fa288016428, name=0x7fa2bcc4b4e0 "./test/t", to=0x0) at /data/src/10.5/storage/connect/ha_connect.cc:5216

#9  0x00007fa2ad4cbd2c in ha_connect::delete_table (this=0x7fa288016428, name=0x7fa2bcc4b4e0 "./test/t") at /data/src/10.5/storage/connect/ha_connect.cc:5245

#10 0x000055757c8e763d in hton_drop_table (hton=0x7fa2881b3ca8, path=0x7fa2bcc4b4e0 "./test/t") at /data/src/10.5/sql/handler.cc:564

#11 0x000055757c8ecd71 in ha_delete_table (thd=0x7fa288000db8, hton=0x7fa2881b3ca8, path=0x7fa2bcc4b4e0 "./test/t", db=0x7fa2bcc4c820, alias=0x7fa2bcc4c830, generate_warning=false) at /data/src/10.5/sql/handler.cc:2770

#12 0x000055757c66fd14 in quick_rm_table (thd=0x7fa288000db8, base=0x7fa2881b3ca8, db=0x7fa2bcc4c820, table_name=0x7fa2bcc4c830, flags=4, table_path=0x0) at /data/src/10.5/sql/sql_table.cc:2884

#13 0x000055757c687be5 in mysql_alter_table (thd=0x7fa288000db8, new_db=0x7fa288005800, new_name=0x7fa288005c00, create_info=0x7fa2bcc4d420, table_list=0x7fa288014018, alter_info=0x7fa2bcc4d350, order_num=0, order=0x0, ignore=false, if_exists=false) at /data/src/10.5/sql/sql_table.cc:11014

#14 0x000055757c72ea94 in Sql_cmd_alter_table::execute (this=0x7fa2880146f8, thd=0x7fa288000db8) at /data/src/10.5/sql/sql_alter.cc:539

#15 0x000055757c5859cc in mysql_execute_command (thd=0x7fa288000db8) at /data/src/10.5/sql/sql_parse.cc:6006

#16 0x000055757c58bd88 in mysql_parse (thd=0x7fa288000db8, rawbuf=0x7fa288013f30 "ALTER TABLE t ENGINE InnoDB", length=27, parser_state=0x7fa2bcc4e510, is_com_multi=false, is_next_command=false) at /data/src/10.5/sql/sql_parse.cc:8042

#17 0x000055757c577d6b in dispatch_command (command=COM_QUERY, thd=0x7fa288000db8, packet=0x7fa2880090a9 "", packet_length=27, is_com_multi=false, is_next_command=false) at /data/src/10.5/sql/sql_parse.cc:1872

#18 0x000055757c57655f in do_command (thd=0x7fa288000db8) at /data/src/10.5/sql/sql_parse.cc:1353

#19 0x000055757c723e57 in do_handle_one_connection (connect=0x55757f167608, put_in_cache=true) at /data/src/10.5/sql/sql_connect.cc:1410

#20 0x000055757c723bba in handle_one_connection (arg=0x55757f181068) at /data/src/10.5/sql/sql_connect.cc:1312

#21 0x000055757cc8248f in pfs_spawn_thread (arg=0x55757f167248) at /data/src/10.5/storage/perfschema/pfs.cc:2201

#22 0x00007fa2c3dbe609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#23 0x00007fa2c3992293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95