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 ('5055d0e05a6a6b27f92034b28997a4e6', -1, 1708759431, 1708759431, '2cc014f0', 2, 0, 0)

Line : 187
File : sessions.php