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 ('ff07cefb0b5dfa14e125f946db2ff899', -1, 1713460000, 1713460000, '0395fc25', -7, 0, 0)

Line : 187
File : sessions.php