react-table render component inside data

In addition to @Clarity's answer, there's also a possibility to access the cell's value at the Cell's property level:

const columns = [
  {
    Header: "Image",
    accessor: "imageUrl",
    maxWidth: 70,
    minWidth: 70,
    Cell: ({ cell: { value } }) => (
      <img
        src={value}
        width={60}
      />
    )
  }
];

You're passing a react component to a data field that expects a string. Try customising your cell via Cell props:

const columns = [
  {
    Header: "Image",
    accessor: "imageUrl",
    maxWidth: 70,
    minWidth: 70,
    Cell: props => <PlaceholderImage width={60} textColor="#fff" text="Image" />
  }
];