serializeValueToAttribute returns undefined

[torsoe]

serializeValueToAttribute: function (value, attribute, node) {
  if (attribute === 'class') {
    var host = node === this ? Polymer.dom(this).getOwnerRoot() || this.dataHost : this;
    if (host) {
      value = host._scopeElementClass(node, value);
    }

throws an error "TypeError: element is undefined"

serializeValueToAttribute: function (value, attribute, node) {
  if (attribute === 'class') {
    var host = node === this ? Polymer.dom(this).getOwnerRoot() || this.dataHost : this;
    if (host) {
      value = host._scopeElementClass(host, value);
    }

returns the right result

[kevinpschaaf]

Probably should be

    if (host && node) {
      value = host._scopeElementClass(node, value);
    }