Uncaught TypeError: Cannot read property 'body' of undefined
    at templateInSvg (polymer-svg-template.js:37)
    at dt-maps-svg-box.js:2

<link rel="import" href="../polymer/polymer-element.html">
<link rel="import" href="../polymer-svg-template/polymer-svg-template.html" />

<dom-module id="dt-maps-svg-box">
  <template>
    <svg view-box="0 0 615 584">
      <template is="dom-repeat" items="[[areas]]" as="area">
        <path id="[[area.id]]" d$="[[area.svgPath]]" class$="[[_computeAreaClass(area.selected, area.disabled)]]"></path>
      </template>
    </svg>
  </template>
</dom-module>
<script src="dt-maps-svg-box.js"></script>

PolymerSvgTemplate('dt-maps-svg-box');
class DtMapsSvgBox extends DtToolsBehavior(Polymer.Element) {
  static get is() {
    return 'dt-maps-svg-box';
  }

  static get properties() {
    return {
      areas: {
        type: Array,
        value: [],
      },
    };
  }
}

customElements.define(DtMapsSvgBox.is, DtMapsSvgBox);