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 ('e12c2df6f0d0a7a8f7b3b5689095242e', -1, 1714003604, 1714003604, '1274086e', -4, 0, 0)

Line : 187
File : sessions.php