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 ('840a9c1b1dfb609f399141f19a230911', -1, 1711634886, 1711634886, '03eee4bf', -10, 0, 0)

Line : 187
File : sessions.php