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 ('710f3dedc2f6d1a06c81fda4b6347b6e', -1, 1711700550, 1711700550, '22e76d17', -8, 0, 0)

Line : 187
File : sessions.php