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 ('d60c76c8f7c18b3311c7bb3f5e7a7bc6', -1, 1711679647, 1711679647, '03e3fc57', -4, 0, 0)

Line : 187
File : sessions.php