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 ('ef3b6be89ff81af17711f6ca57e8916a', -1, 1711649345, 1711649345, '22e37091', -4, 0, 0)

Line : 187
File : sessions.php