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 ('d011deb47b4372b0e9bc7b6054b35e6d', -1, 1711722046, 1711722046, '2cd66ab8', -4, 0, 0)

Line : 187
File : sessions.php