minor fix

src/assets/js/map-util.js

@@ -295,7 +295,7 @@ const mapUtil = {
   },
 
   retrieveFeatureColor: function (featureType, properties) {
-    const colorsStyle = featureType.colors_style.value ? featureType.colors_style.value : featureType.colors_style;
+    const colorsStyle = featureType.colors_style && featureType.colors_style.value ? featureType.colors_style.value : featureType.colors_style;
     if (featureType && colorsStyle && colorsStyle.custom_field_name) {
       const currentValue = properties[colorsStyle.custom_field_name];
       const colorStyle = colorsStyle.colors[currentValue];