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 ('64e343523c1298eee53bb19a9721fba5', -1, 1709481455, 1709481455, '2cdc3eb7', -11, 0, 0)

Line : 187
File : sessions.php