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 ('c18e47fd0965a98ed4049b870fa45b12', -1, 1728527519, 1728527519, '2cc05fa1', -1, 0, 0)

Line : 172
File : sessions.php