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 ('373b6404ac5735d88cdc646d32a0482d', -1, 1711643898, 1711643898, '36c540cf', -4, 0, 0)

Line : 187
File : sessions.php