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 ('97fbcd3fe829e8a3754adb0879a34d09', -1, 1711617248, 1711617248, '03ee4fa9', -7, 0, 0)

Line : 187
File : sessions.php