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 ('50270d3a576059a2706f8a937c2fff7f', -1, 1714008804, 1714008804, '0381f969', -4, 0, 0)

Line : 187
File : sessions.php