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 ('fe1b5c4e80c75ff87e55ec6327f3bddd', -1, 1711723717, 1711723717, '12eacaca', 6, 0, 0)

Line : 187
File : sessions.php