值求值后,ag grid cellRenderer无法呈现单元格

我有一个内联cellRenderer来修改单元格内的值,如下所示:

cellRenderer: function (params) {
  if(params.value) {
    return params.value * 100;
  }
  return '';
}

我在调试视图中观察到它正在正确计算该值。请找到截图

但是,当控件移出cellRenderer时,会引发以下异常:

ERROR TypeError: Failed to execute 'appendChild' on 'Node': parameter 1 is not of type 'Node'.
at CellComp.push../node_modules/ag-grid/dist/lib/rendering/cellComp.js.CellComp.afterCellRendererCreated (cellComp.js:582)
at Promise.push../node_modules/ag-grid/dist/lib/utils.js.Promise.then (utils.js:1543)
at CellComp.push../node_modules/ag-grid/dist/lib/rendering/cellComp.js.CellComp.createCellRendererInstance (cellComp.js:564)
at CellComp.push../node_modules/ag-grid/dist/lib/rendering/cellComp.js.CellComp.attachCellRenderer (cellComp.js:589)
at CellComp.push../node_modules/ag-grid/dist/lib/rendering/cellComp.js.CellComp.afterAttached (cellComp.js:100)
at rowComp.js:938
at Array.forEach (<anonymous>)
at RowComp.push../node_modules/ag-grid/dist/lib/rendering/rowComp.js.RowComp.callAfterRowAttachedOnCells (rowComp.js:936)
at RowComp.push../node_modules/ag-grid/dist/lib/rendering/rowComp.js.RowComp.insertCellsIntoContainer (rowComp.js:554)
at RowComp.push../node_modules/ag-grid/dist/lib/rendering/rowComp.js.RowComp.refreshCellsInAnimationFrame (rowComp.js:460)

cellRenderer: function (params) {
  return params.context.formatDate(params.data.createdDateTime);
}

我在用 "ag-grid-enterprise": "^16.0.0", 角度6。