Cannot Read Property "field' of Null

instead of
$w ( ‘#aurora’ ). html = results . city ;
try
$w ( ‘#aurora’ ). html =${ results['city'] } ;

$w ( ‘#aurora’ ). html = results . city ;
if the object results does not have the property city it will throw an error and stop execution

you could also try this

$w ( ‘#aurora’ ). html = (results .hasOwnProperty(" city"))? results . city:“No city property found” ;

not sure why you are using .html instead of .text though