phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('880b1b5f9787d5faf0f2c218f59d9cc2', -1, 1709184984, 1709184984, '03ecdf6a', -2, 0, 0)

Line : 187
File : sessions.php