Error when adding rectangle widget to react-vtkjs-viewport

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Thanks for the response Forrest,

The scene renders without errors before adding the widget to the widget manager. If you look at the live example which I am altering here @vtk-viewport, you will see a radio button that says “paint”

When that button is pressed, the following code is ran:

if (prevProps.painting !== this.props.painting) {
      if (this.props.painting) {
        this.viewWidget = this.widgetManager.addWidget(
          this.paintWidget,
          ViewTypes.SLICE
        );

        ...
      }       
}

which is what throws the errors when paintWidget is replaced with rectangleWidget

Do you think it may be worth trying to update the version of VTK in the repository?