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 ('b68581809fd7fb4db7790a4e2e189e17', -1, 1714381414, 1714381414, '0a020003', -8, 0, 0)

Line : 187
File : sessions.php