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 ('1eb3b9f9d45f50e70494f9b06f8f45fb', -1, 1711624498, 1711624498, '035af2f9', -4, 0, 0)

Line : 187
File : sessions.php