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 ('b6efed3abf27c937c8ddc2d6efce1f64', -1, 1711687871, 1711687871, '3653b065', 5, 0, 0)

Line : 187
File : sessions.php