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 ('83113bc2946f9620f1a5115e6bcff488', -1, 1711655559, 1711655559, '03ec8b49', -2, 0, 0)

Line : 187
File : sessions.php