Spider: SIGSEGV in spider_db_bulk_insert on INSERT DELAYED

INSTALL PLUGIN spider SONAME 'ha_spider.so';

SET sql_mode='';

CREATE TABLE t (a INT) ENGINE=SPIDER;

INSERT DELAYED INTO t VALUES (1);

INSERT DELAYED INTO t VALUES (1);

SELECT 1;  # Shows server is gone

Core was generated by `/test/MD121121-mariadb-10.7.2-linux-x86_64-dbg/bin/mysqld --no-defaults --core-'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0  0x0000148d7c81d1e3 in spider_db_bulk_insert (

    spider=spider@entry=0x148cf4004d70, table=0x148cf4004498, 

    copy_info=copy_info@entry=0x148cf4005160, bulk_end=bulk_end@entry=false)

    at /test/10.7_dbg/storage/spider/spd_db_conn.cc:6714

[Current thread is 1 (Thread 0x148d900ea700 (LWP 2786829))]

(gdb) bt

#0  0x0000148d7c81d1e3 in spider_db_bulk_insert (spider=spider@entry=0x148cf4004d70, table=0x148cf4004498, copy_info=copy_info@entry=0x148cf4005160, bulk_end=bulk_end@entry=false) at /test/10.7_dbg/storage/spider/spd_db_conn.cc:6714

#1  0x0000148d7c8aa51c in ha_spider::write_row (this=0x148cf4004d70, buf=0x148cf40048e8 "\375\001") at /test/10.7_dbg/storage/spider/ha_spider.cc:10039

#2  0x000055d4476d2559 in handler::ha_write_row (this=0x148cf4004d70, buf=0x148cf40048e8 "\375\001") at /test/10.7_dbg/sql/handler.cc:7516

#3  0x000055d447371eee in write_record (thd=thd@entry=0x148d4c07c768, table=0x148cf4004498, info=info@entry=0x148d4c083508, sink=sink@entry=0x0) at /test/10.7_dbg/sql/sql_insert.cc:2156

#4  0x000055d4473749c0 in Delayed_insert::handle_inserts (this=this@entry=0x148d4c07c748) at /test/10.7_dbg/sql/sql_insert.cc:3597

#5  0x000055d447376439 in handle_delayed_insert (arg=arg@entry=0x148d4c07c748) at /test/10.7_dbg/sql/sql_insert.cc:3337

#6  0x000055d4479bb4ca in pfs_spawn_thread (arg=0x55d44ad00a18) at /test/10.7_dbg/storage/perfschema/pfs.cc:2201

#7  0x0000148d92e22609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#8  0x0000148d92a10293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95