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 ('59e9cbda0bd4348af2c1a970479d72dd', -1, 1550507846, 1550507846, '22e473d8', 25, 0)

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