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 ('a26abf5d4e7dc6a3c44903ea9cb5f990', -1, 1713912985, 1713912985, '1276b8ed', -4, 0, 0)

Line : 187
File : sessions.php