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 ('3c669042a3605c2d32bd87b0e745f2e9', -1, 1713891978, 1713891978, '030f9c8c', -4, 0, 0)

Line : 187
File : sessions.php