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 ('f944c7b9ccda0bf0446a651ae7f931dc', -1, 1634631865, 1634631865, '03ef3221', 0, 0, 0)

Line : 187
File : sessions.php