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 ('35807d3b74b96f5c2631a48fa7833743', -1, 1714038081, 1714038081, '038d08f7', -4, 0, 0)

Line : 187
File : sessions.php