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 ('16e3a86bfe350108b2d8602b3df6a847', -1, 1713912800, 1713912800, '0395fc25', -7, 0, 0)

Line : 187
File : sessions.php