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 ('3ca0f5c23e175d95e878e6d9285e2d24', -1, 1711693446, 1711693446, '03eb16e1', -4, 0, 0)

Line : 187
File : sessions.php