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 ('b6c435d1e22b15a179738a88d6df1e15', -1, 1747776733, 1747776733, '12df7c5b', 33, 0, 0)

Line : 190
File : sessions.php