Uncaught TypeError: Cannot read property of undefined - Google Maps Javascript API -


i developping web app using google maps javascript api. worked fine until few hours ago, when got these errors :

`uncaught typeerror: cannot read property '15' of undefined` `uncaught typeerror: cannot read property '9' of undefined`

here html code :

<!doctype html> <html>     <head>         <title>application</title>         <meta name="viewport" content="initial-scale=1.0">         <meta charset="utf-8">         <style>             html, body {                 height: 100%;                 margin: 0;                 padding: 0;             }         </style>         <script src="https://d3js.org/d3.v4.js"></script>         <script type="text/javascript" src="main.js"></script>         <script type="text/javascript" src="script.js"></script>         <script src="https://maps.googleapis.com/maps/api/js?key=my_key&callback=initmap" async defer></script>     </head>     <body>         <h1 align="center">notre super indicateur</h1>         <div id="map" style="width:1000px; height:800px; margin-left:auto; margin-right:auto;"></div>     </body> </html>

and here script.js file :

function initmap() {      var tab = arraydata;      var map = new google.maps.map(document.getelementbyid('map'), {         center: {lat: 48.856583, lng: 2.337341},         zoom: 12     });      map.data.loadgeojson('some geojson file');      map.data.setstyle(function(feature) {          var color;         var nb = feature.getproperty("c_qu");          if (tab[nb-1].index < 0.3) {             color = "red";         }         else if (tab[nb-1].index < 0.6) {             color = "orange";         }         else {             color = "green";         }          return /** @type {google.maps.data.styleoptions} */({             fillcolor: color,             strokecolor: "grey",             strokeweight: 2         });     });  }

note : arraydata defined in main.js file

this weird : error said in script.js file, when update error stays @ same line. weirder fact once in 15 or 20 times, works (and code on github pages , works fine).

could me this? thank ! tom.


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