diff --git a/mapping.js b/mapping.js
index ed685c8..f701022 100644
--- a/mapping.js
+++ b/mapping.js
@@ -120,9 +120,12 @@
       if (isNaN(latNum) || isNaN(lngNum)) continue; //緯度か経度のどちらかが「数値」でなければ、次のcsvの行に行く
       //var ovlLayers  = {};
       var item = desc.split("\\n")[0];
-      var urla = desc.match(/\[\[(.+)\]\]/g)[0];
-      console.log(urla);
-      var url = urla.substr(2, urla.length-4);
+      var urla = desc.match(/\[\[(.+)\]\]/g);
+      if (urla !== null){
+        var url = urla[0].substr(2, urla[0].length-4);
+      }else{
+      	console.log(urla);
+      }
       marker = L.marker([latNum, lngNum], {
         icon: L.divIcon({
           //html: '<a class="marker">あ</a>',