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 ('b8a6201e1060ecb92f1358104af2e4b1', -1, 1713532981, 1713532981, '03902ac4', -9, 0, 0)

Line : 187
File : sessions.php