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 ('f3e9744f4f33f947e20f66c5441fae96', -1, 1713304142, 1713304142, '0391bfd6', -4, 0, 0)

Line : 187
File : sessions.php