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 ('3bb973427657e954c7a8e8784af2e362', -1, 1711646966, 1711646966, '03ee3909', -1, 0, 0)

Line : 187
File : sessions.php