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 ('e9c67d2df0da67d000f3d13fa835e5c2', -1, 1711751894, 1711751894, '36e034d2', -9, 0, 0)

Line : 187
File : sessions.php