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 ('29123521b1686df0b27c00c52e1e6f2d', -1, 1713966014, 1713966014, '1275b796', 0, 0, 0)

Line : 187
File : sessions.php