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 ('cf292f5168bf693bc2f75793e09909fb', -1, 1711640889, 1711640889, '0358fe32', -10, 0, 0)

Line : 187
File : sessions.php