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 ('17511596e81523901e5d0dc36c12e0d0', -1, 1711698269, 1711698269, '12cd4377', -4, 0, 0)

Line : 187
File : sessions.php