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 ('b10d828bb73faad6029fb1f637ea63ab', -1, 1711702388, 1711702388, '03d6b845', 3, 0, 0)

Line : 187
File : sessions.php