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 ('c660a758c8f34789f9f53e0a938bad87', -1, 1713509997, 1713509997, '12d87937', -4, 0, 0)

Line : 187
File : sessions.php