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 ('a7b99771df5480c070e7f7ac4dfeef31', -1, 1730973847, 1730973847, '2cdcff8d', 5, 0, 0)

Line : 195
File : sessions.php