phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO oka_phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('3b04d094dbee9c9e3978a5f8d6b58be1', -1, 1550509165, 1550509165, '22e473d8', -9, 0)

Line : 184
File : /home/c128/public_html/talk/includes/sessions.php