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 ('ee781f2f56851c140b4bd7b0512c98bf', -1, 1714002497, 1714002497, '12e2bb18', -10, 0, 0)

Line : 187
File : sessions.php