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 ('34ad7ed721c4110e71e13c9fa412e927', -1, 1714005968, 1714005968, '12e095f2', -8, 0, 0)

Line : 187
File : sessions.php