Crash with PREPARE + SP out parameter + literal

DELIMITER $$

CREATE OR REPLACE PROCEDURE p1(OUT a INT)

BEGIN

  SET a= 10;

END;

$$

DELIMITER ;

PREPARE stmt FROM 'CALL p1(?)';

EXECUTE stmt USING 10;

#0  0x00007ffff5994a28 in raise () from /lib64/libc.so.6

#1  0x00007ffff599662a in abort () from /lib64/libc.so.6

#2  0x00007ffff598d227 in __assert_fail_base () from /lib64/libc.so.6

#3  0x00007ffff598d2d2 in __assert_fail () from /lib64/libc.so.6

#4  0x0000555555a2a58c in Protocol_text::send_out_parameters (

    this=0x7ffeb1016600, sp_params=0x7ffeb110def8)

    at /home/bar/maria-git/server.10.2/sql/protocol.cc:1326

#5  0x0000555555b1a2fd in Prepared_statement::execute (this=0x7ffeb101da70, 

    expanded_query=0x7ffff7f2f0c0, open_cursor=false)

    at /home/bar/maria-git/server.10.2/sql/sql_prepare.cc:4698

#6  0x0000555555b184c8 in Prepared_statement::execute_loop (

    this=0x7ffeb101da70, expanded_query=0x7ffff7f2f0c0, open_cursor=false, 

    packet=0x0, packet_end=0x0)

    at /home/bar/maria-git/server.10.2/sql/sql_prepare.cc:4083

#7  0x0000555555b16246 in mysql_sql_stmt_execute (thd=0x7ffeb1016070)

    at /home/bar/maria-git/server.10.2/sql/sql_prepare.cc:3193

#8  0x0000555555aef38f in mysql_execute_command (thd=0x7ffeb1016070)

    at /home/bar/maria-git/server.10.2/sql/sql_parse.cc:3445

#9  0x0000555555afcf83 in mysql_parse (thd=0x7ffeb1016070, 

    rawbuf=0x7ffeb1063088 "EXECUTE stmt USING 10", length=21, 

    parser_state=0x7ffff7f2fd20, is_com_multi=false, is_next_command=false)

mysqld: /data/src/10.2/sql/protocol.cc:1326: virtual Protocol_text::send_out_parameters(List<Item_param>*): Assertion `0' failed.

170112 12:44:08 [ERROR] mysqld got signal 6 ;