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) VALUES ('8b4cf66d7b34e0443f83db7bb3c29a4e', -1, 1714299718, 1714299718, '0391a607', -4, 0)

Line : 158
File : sessions.php