phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('78b6a66777d58fc4fcdd69be43bf2bf5', -1, 1748802036, 1748802036, 'd849d8de', 9, 0, 0)

Line : 187
File : sessions.php