Assertion `0' failed in Protocol::end_statement upon GRANT with non-existing plugin

CREATE USER foo;

GRANT ALL ON *.* TO foo IDENTIFIED WITH non_existing_plugin;

# Cleanup

DROP USER foo;

mysqld: /data/src/10.4-travis/sql/protocol.cc:588: void Protocol::end_statement(): Assertion `0' failed.

181209  3:35:24 [ERROR] mysqld got signal 6 ;

#7  0x00007f2a9636eee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6

#8  0x000055c35c3b24ba in Protocol::end_statement (this=0x7f2a800010b8) at /data/src/10.4-travis/sql/protocol.cc:588

#9  0x000055c35c4c1833 in dispatch_command (command=COM_QUERY, thd=0x7f2a80000b00, packet=0x7f2a8000b411 "GRANT ALL ON *.* TO foo IDENTIFIED WITH non_existing_plugin", packet_length=59, is_com_multi=false, is_next_command=false) at /data/src/10.4-travis/sql/sql_parse.cc:2408

#10 0x000055c35c4be6b2 in do_command (thd=0x7f2a80000b00) at /data/src/10.4-travis/sql/sql_parse.cc:1396

#11 0x000055c35c62a1a0 in do_handle_one_connection (connect=0x55c3601c4a70) at /data/src/10.4-travis/sql/sql_connect.cc:1402

#12 0x000055c35c629f24 in handle_one_connection (arg=0x55c3601c4a70) at /data/src/10.4-travis/sql/sql_connect.cc:1308

#13 0x000055c35cae141a in pfs_spawn_thread (arg=0x55c3602bd4b0) at /data/src/10.4-travis/storage/perfschema/pfs.cc:1862

#14 0x00007f2a97e2a494 in start_thread (arg=0x7f2a90516700) at pthread_create.c:333

#15 0x00007f2a9642b93f in clone () from /lib/x86_64-linux-gnu/libc.so.6