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 ('7fce37677d239976a8e6c12c38a02ca8', -1, 1708706725, 1708706725, '2cdc3eb7', -11, 0, 0)

Line : 187
File : sessions.php