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 ('8d487db70a5fb7fc1655cb76ceee80fe', -1, 1730419900, 1730419900, '12e25d68', -4, 0, 0)

Line : 195
File : sessions.php