Assertion `global_status_var.global_memory_used == 0' failed or bytes lost after inserting into table with non-null blob and trigger

CREATE TABLE t1 (b BLOB NOT NULL);

CREATE TRIGGER tr BEFORE UPDATE ON t1 FOR EACH ROW BEGIN END;

INSERT INTO t1 VALUES ( 'foo');

# Cleanup

DROP TABLE t1;

Warning:    8 bytes lost at 0x7f1ecf820570, allocated by T@0 at 0x55dd506c46d7, 0x55dd5055ffbf, 0x55dd5083915c, 0x55dd5086664f, 0x55dd50875266, sql/sql_string.cc:46, sql/sql_string.h:326, sql/field.cc:7992

Memory lost: 8 bytes in 1 chunks

2018-05-05  2:25:22 140564761794304 [Note] /data/bld/10.2/bin/mysqld: Shutdown complete

mysqld: /data/src/10.2/sql/mysqld.cc:2174: void mysqld_exit(int): Assertion `global_status_var.global_memory_used == 0' failed.

180505  2:25:22 [ERROR] mysqld got signal 6 ;