message: Fix runtime type error
diff: @@ -47,9 +47,9 @@ export class TableCell extends React.Component<LocalTableCellProps, TableCellSta
  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 });
  + const headRowElement = _get(headElement, 'childNodes[0]');
  + const headCellElement = _get(headRowElement, `childNodes[${cellIndex}]`);
  + this.setState({ title: _get(headCellElement, 'innerText') });
  }
  }
  }
  