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 ('5272de44ca773ba94780856f7ca7a3df', -1, 1711712010, 1711712010, '03e3e5c2', -2, 0, 0)

Line : 187
File : sessions.php