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 ('bd906d999f7654f05d70a9c97a69990e', -1, 1709443708, 1709443708, '03ed2215', -4, 0, 0)

Line : 187
File : sessions.php