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 ('804082ec2d799287efa4af266c950705', -1, 1711621609, 1711621609, '36ea8893', 0, 0, 0)

Line : 187
File : sessions.php