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 ('a87f029d61db240e32b3a98a616f2d65', -1, 1713511044, 1713511044, '12d8baa4', -4, 0, 0)

Line : 187
File : sessions.php