Error while clicking on the Fusion button at OHIF - XNAT

Question

I have run OHIF-XNAT viewer using React with the Orthanc server, and as I try to use the 'Fusion' button, the application crashes. Here's the log after pressing the button:

console log:

LoggerProvider.js:41 TypeError: Cannot convert undefined or null to object
    at Function.keys (<anonymous>)
    at VTKImageFusionDialog.getLayerList (VTKImageFusionDialog.js:156:1)
    at VTKImageFusionDialog.getLayerList (react-hot-loader.development.js:714:1)
    at VTKImageFusionDialog.componentDidMount (VTKImageFusionDialog.js:85:1)
    at VTKImageFusionDialog.componentDidMount (react-hot-loader.development.js:704:1)
    at commitLifeCycles (react-dom.development.js:22068:1)
    at commitLayoutEffects (react-dom.development.js:25302:1)
    at HTMLUnknownElement.callCallback (react-dom.development.js:336:1)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:385:1)
    at invokeGuardedCallback (react-dom.development.js:440:1)