Assertion `0' failed in Protocol::end_statement upon concurrent UPDATE

--source include/have_innodb.inc

CREATE OR REPLACE TABLE t1 (pk INT, a CHAR(3), b CHAR(3), PRIMARY KEY(pk)) 

  ENGINE=InnoDB WITH SYSTEM VERSIONING CHARACTER SET ucs2;

INSERT INTO t1 (pk) VALUES (1);

--connect (con1,localhost,root,,test)

--send

  UPDATE t1 SET a = 'bar';

--connection default

UPDATE t1 SET b = 'foo';

--connection con1

--reap

# Cleanup

--disconnect con1

--connection default

DROP TABLE t1;

mysqld: /data/src/10.3/sql/protocol.cc:587: void Protocol::end_statement(): Assertion `0' failed.

180123  1:21:57 [ERROR] mysqld got signal 6 ;

#7  0x00007f29141b0ee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6

#8  0x000055a48947503c in Protocol::end_statement (this=0x7f28b00010e0) at /data/src/10.3/sql/protocol.cc:587

#9  0x000055a4895526a6 in dispatch_command (command=COM_QUERY, thd=0x7f28b0000b00, packet=0x7f28b000b141 "UPDATE t1 SET a = 'bar'", packet_length=23, is_com_multi=false, is_next_command=false) at /data/src/10.3/sql/sql_parse.cc:2381

#10 0x000055a48954f523 in do_command (thd=0x7f28b0000b00) at /data/src/10.3/sql/sql_parse.cc:1370

#11 0x000055a4896b6768 in do_handle_one_connection (connect=0x55a48c3408c0) at /data/src/10.3/sql/sql_connect.cc:1401

#12 0x000055a4896b64f5 in handle_one_connection (arg=0x55a48c3408c0) at /data/src/10.3/sql/sql_connect.cc:1307

#13 0x000055a489b540b8 in pfs_spawn_thread (arg=0x55a48c3496a0) at /data/src/10.3/storage/perfschema/pfs.cc:1862

#14 0x00007f2915e87494 in start_thread (arg=0x7f290455f700) at pthread_create.c:333

#15 0x00007f291426d93f in clone () from /lib/x86_64-linux-gnu/libc.so.6