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 ('5628369f9fe9875f5937986862b8b8cb', -1, 1713512111, 1713512111, '1276020f', -4, 0, 0)

Line : 187
File : sessions.php