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 ('3310b12405c6e7a15856f9f52d0989e1', -1, 1711634621, 1711634621, '36e07cd9', 7, 0, 0)

Line : 187
File : sessions.php