message: Guard undefined head element
diff: @@ -46,11 +46,13 @@ export class TableCell extends React.Component<LocalTableCellProps, TableCellSta
  // @ts-ignore
  NodeList.prototype.find = Array.prototype.find;
  const headElement = tableElementChildren.find((child: any) => child.tagName === 'THEAD');
  + if (headElement && headElement.childNodes) {
  const headRowElement = headElement.childNodes[0];
  const headCellElement = headRowElement.childNodes[cellIndex];
  this.setState({ title: headCellElement.innerText });
  }
  }
  + }
  };
  render = () => {
  