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 ('476e1e4f6b477b675ca8621e2148101f', -1, 1714064667, 1714064667, '12e03f57', -4, 0, 0)

Line : 187
File : sessions.php