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 ('5ed852a42ab76dc340199f207dd34a7d', -1, 1713582747, 1713582747, '12767ef1', -4, 0, 0)

Line : 187
File : sessions.php