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 ('c8991d6be4f30d78a8f7dac65cd6c5fa', -1, 1714771969, 1714771969, '030e8218', -4, 0, 0)

Line : 187
File : sessions.php