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 ('c3014ca483e3a9947843ac33c8a9e544', -1, 1711663299, 1711663299, '2cc865aa', -7, 0, 0)

Line : 187
File : sessions.php