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 ('8cf8edac49c28976f22ca980e1edef5d', -1, 1714027135, 1714027135, '038d1fd1', -4, 0, 0)

Line : 187
File : sessions.php