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 ('2450bc2ce02df3c9fd5244a03d64c585', -1, 1634635602, 1634635602, '03ef3221', 46, 0, 0)

Line : 187
File : sessions.php