Server crashes in in myrocks::ha_rocksdb::load_auto_incr_value_from_index upon altering AUTO_INCREMENT on a table without index

# Run with RocksDB

CREATE OR REPLACE TABLE t1 (a INT) ENGINE=RocksDB;

INSERT INTO t1 VALUES (1);

ALTER TABLE t1 AUTO_INCREMENT 10;

# Cleanup

DROP TABLE t1;

#3  <signal handler called>

#4  0x00007f3d0d2c9ae4 in myrocks::ha_rocksdb::load_auto_incr_value_from_index (this=0x7f3cdc0098f8) at /data/src/10.2/storage/rocksdb/ha_rocksdb.cc:5152

#5  0x00007f3d0d2df34c in myrocks::ha_rocksdb::prepare_inplace_alter_table (this=0x7f3cdc0098f8, altered_table=0x7f3cdc0b3ce0, ha_alter_info=0x7f3d04dd6610) at /data/src/10.2/storage/rocksdb/ha_rocksdb.cc:11737

#6  0x0000557afc412083 in handler::ha_prepare_inplace_alter_table (this=0x7f3cdc0098f8, altered_table=0x7f3cdc0b3ce0, ha_alter_info=0x7f3d04dd6610) at /data/src/10.2/sql/handler.cc:4210

#7  0x0000557afc264e01 in mysql_inplace_alter_table (thd=0x7f3cdc000b00, table_list=0x7f3cdc012538, table=0x7f3cdc0c6b10, altered_table=0x7f3cdc0b3ce0, ha_alter_info=0x7f3d04dd6610, inplace_supported=HA_ALTER_INPLACE_SHARED_LOCK_AFTER_PREPARE, target_mdl_request=0x7f3d04dd6680, alter_ctx=0x7f3d04dd7240) at /data/src/10.2/sql/sql_table.cc:7301

#8  0x0000557afc26a5ca in mysql_alter_table (thd=0x7f3cdc000b00, new_db=0x7f3cdc012b48 "test", new_name=0x0, create_info=0x7f3d04dd7e50, table_list=0x7f3cdc012538, alter_info=0x7f3d04dd7da0, order_num=0, order=0x0, ignore=false) at /data/src/10.2/sql/sql_table.cc:9355

#9  0x0000557afc2e4346 in Sql_cmd_alter_table::execute (this=0x7f3cdc012b58, thd=0x7f3cdc000b00) at /data/src/10.2/sql/sql_alter.cc:324

#10 0x0000557afc19eedc in mysql_execute_command (thd=0x7f3cdc000b00) at /data/src/10.2/sql/sql_parse.cc:6224

#11 0x0000557afc1a3a48 in mysql_parse (thd=0x7f3cdc000b00, rawbuf=0x7f3cdc012448 "ALTER TABLE t1 AUTO_INCREMENT 10", length=32, parser_state=0x7f3d04dd9200, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:7940

#12 0x0000557afc191739 in dispatch_command (command=COM_QUERY, thd=0x7f3cdc000b00, packet=0x7f3cdc18baf1 "ALTER TABLE t1 AUTO_INCREMENT 10", packet_length=32, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:1820

#13 0x0000557afc19009c in do_command (thd=0x7f3cdc000b00) at /data/src/10.2/sql/sql_parse.cc:1374

#14 0x0000557afc2df038 in do_handle_one_connection (connect=0x557aff461290) at /data/src/10.2/sql/sql_connect.cc:1335

#15 0x0000557afc2dedc5 in handle_one_connection (arg=0x557aff461290) at /data/src/10.2/sql/sql_connect.cc:1241

#16 0x0000557afc6fffa0 in pfs_spawn_thread (arg=0x557aff46b800) at /data/src/10.2/storage/perfschema/pfs.cc:1862

#17 0x00007f3d143e1494 in start_thread (arg=0x7f3d04dda700) at pthread_create.c:333

#18 0x00007f3d127c793f in clone () from /lib/x86_64-linux-gnu/libc.so.6