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 ('06f2ad0e2d1e5ea8af4a8c1dea495af9', -1, 1711623767, 1711623767, '2ccc2240', -4, 0, 0)

Line : 187
File : sessions.php