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 ('2a91ed3f4e00eb3e6b838dfe156f59a4', -1, 1711677095, 1711677095, '2cc8a95b', 0, 0, 0)

Line : 187
File : sessions.php