Assertion `fixed' failed in Item_direct_view_ref::used_tables on 2nd execution of PS with view

CREATE TABLE t1 (a VARCHAR(8));

INSERT INTO t1 VALUES ('foo'),('bar');

CREATE VIEW v1 AS SELECT * FROM t1;

PREPARE stmt FROM "SELECT NULLIF( a, CONVERT( 'qux' USING utf8 ) ) FROM v1";

EXECUTE stmt;

EXECUTE stmt;

# Cleanup

DEALLOCATE PREPARE stmt;

DROP VIEW v1;

DROP TABLE t1;

mysqld: /data/src/10.1/sql/item.cc:9872: virtual table_map Item_direct_view_ref::used_tables() const: Assertion `fixed' failed.

180223 23:22:03 [ERROR] mysqld got signal 6 ;

#7  0x00007ff62ee57ee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6

#8  0x0000556733030413 in Item_direct_view_ref::used_tables (this=0x7ff6261af918) at /data/src/10.1/sql/item.cc:9872

#9  0x0000556732d12521 in Used_tables_and_const_cache::used_tables_and_const_cache_join (this=0x7ff6261aca50, item=0x7ff6261af918) at /data/src/10.1/sql/item.h:3648

#10 0x0000556732d125aa in Used_tables_and_const_cache::used_tables_and_const_cache_update_and_join (this=0x7ff6261aca50, item=0x7ff6261af918) at /data/src/10.1/sql/item.h:3654

#11 0x0000556732d125ec in Used_tables_and_const_cache::used_tables_and_const_cache_update_and_join (this=0x7ff6261aca50, argc=3, argv=0x7ff6261acb30) at /data/src/10.1/sql/item.h:3665

#12 0x000055673303f2f6 in Item_func_nullif::update_used_tables (this=0x7ff6261ac9b0) at /data/src/10.1/sql/item_cmpfunc.cc:2602

#13 0x0000556732dba2ab in st_select_lex::update_used_tables (this=0x7ff6261ab858) at /data/src/10.1/sql/sql_lex.cc:4187

#14 0x0000556732e02bef in JOIN::optimize_inner (this=0x7ff626043278) at /data/src/10.1/sql/sql_select.cc:1115

#15 0x0000556732e02926 in JOIN::optimize (this=0x7ff626043278) at /data/src/10.1/sql/sql_select.cc:1058

#16 0x0000556732e0b07a in mysql_select (thd=0x7ff627cd5070, rref_pointer_array=0x7ff6261abb00, tables=0x7ff6261acc10, wild_num=0, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2416184064, result=0x7ff6261ad218, unit=0x7ff6261ab158, select_lex=0x7ff6261ab858) at /data/src/10.1/sql/sql_select.cc:3462

#17 0x0000556732e009f0 in handle_select (thd=0x7ff627cd5070, lex=0x7ff6261ab090, result=0x7ff6261ad218, setup_tables_done_option=0) at /data/src/10.1/sql/sql_select.cc:388

#18 0x0000556732dd0a6e in execute_sqlcom_select (thd=0x7ff627cd5070, all_tables=0x7ff6261acc10) at /data/src/10.1/sql/sql_parse.cc:5926

#19 0x0000556732dc6f44 in mysql_execute_command (thd=0x7ff627cd5070) at /data/src/10.1/sql/sql_parse.cc:2976

#20 0x0000556732dee782 in Prepared_statement::execute (this=0x7ff626146470, expanded_query=0x7ff630edaa00, open_cursor=false) at /data/src/10.1/sql/sql_prepare.cc:4284

#21 0x0000556732ded5ef in Prepared_statement::execute_loop (this=0x7ff626146470, expanded_query=0x7ff630edaa00, open_cursor=false, packet=0x0, packet_end=0x0) at /data/src/10.1/sql/sql_prepare.cc:3916

#22 0x0000556732deb667 in mysql_sql_stmt_execute (thd=0x7ff627cd5070) at /data/src/10.1/sql/sql_prepare.cc:3042

#23 0x0000556732dc6f75 in mysql_execute_command (thd=0x7ff627cd5070) at /data/src/10.1/sql/sql_parse.cc:2987

#24 0x0000556732dd41c3 in mysql_parse (thd=0x7ff627cd5070, rawbuf=0x7ff626043088 "EXECUTE stmt", length=12, parser_state=0x7ff630edb5e0) at /data/src/10.1/sql/sql_parse.cc:7352

#25 0x0000556732dc3042 in dispatch_command (command=COM_QUERY, thd=0x7ff627cd5070, packet=0x7ff62a7f9071 "EXECUTE stmt", packet_length=12) at /data/src/10.1/sql/sql_parse.cc:1477

#26 0x0000556732dc1dc7 in do_command (thd=0x7ff627cd5070) at /data/src/10.1/sql/sql_parse.cc:1106

#27 0x0000556732efab2b in do_handle_one_connection (thd_arg=0x7ff627cd5070) at /data/src/10.1/sql/sql_connect.cc:1330

#28 0x0000556732efa88f in handle_one_connection (arg=0x7ff627cd5070) at /data/src/10.1/sql/sql_connect.cc:1242

#29 0x00005567332b599e in pfs_spawn_thread (arg=0x7ff62e439ef0) at /data/src/10.1/storage/perfschema/pfs.cc:1861

#30 0x00007ff630b5b494 in start_thread (arg=0x7ff630edcb00) at pthread_create.c:333

#31 0x00007ff62ef1493f in clone () from /lib/x86_64-linux-gnu/libc.so.6