I have this object printed with console.log

Array[1]
    0: Object
       address: "blablabalbala"
       datatype: "Location"
       icon: "cafetaria"
       id: "/mensa/wo_mensa1_turm.std.php"
       kind: "Mensa"
       lat: 50.777016
       lon: 6.080348
       sortkey: "zeltmensa, forum cafete"
       stationId: "/mensa/wo_mensa1_turm.std.php"
       title: "Zeltmensa, Forum Cafete"
       type: "Mensa"

But console.log("nav to: "+data[0].lat+" "+data[0].lon); gives me undefined undefined, and at another point NaN NaN.. I don't understand this. It also doesn't let me use any other attributes like data[0].addresse, which returns undefined aswell.

Thanks for help.