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 ('adfb634c7f5530ed57ab1e804b268a79', -1, 1711622935, 1711622935, '03ed5b62', -4, 0, 0)

Line : 187
File : sessions.php