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 ('a168463f1967b3ac48f1c109285317c0', -1, 1711646021, 1711646021, '345b54db', -4, 0, 0)

Line : 187
File : sessions.php