Incompatible with newer versions of React (~15)

[septagram]

Tested with React 15.5.4. I'm getting the following error whenever I try to render <ReactTour />:

TypeError: this is undefined Stack trace: at Constructor (webpack:///~/react-tour/~/react/lib/ReactClass.js:842:0) at _constructComponentWithoutOwner/< (webpack:///~/react-dom/lib/ReactCompositeComponent.js:306:0) at measureLifeCyclePerf (webpack:///~/react-dom/lib/ReactCompositeComponent.js:75:0) at _constructComponentWithoutOwner (webpack:///~/react-dom/lib/ReactCompositeComponent.js:305:0) at _constructComponent (webpack:///~/react-dom/lib/ReactCompositeComponent.js:280:0) at mountComponent (webpack:///~/react-dom/lib/ReactCompositeComponent.js:188:0) at mountComponent (webpack:///~/react-dom/lib/ReactReconciler.js:46:0) at mountChildren (webpack:///~/react-dom/lib/ReactMultiChild.js:238:0) at _createInitialChildren (webpack:///~/react-dom/lib/ReactDOMComponent.js:697:0) at mountComponent (webpack:///~/react-dom/lib/ReactDOMComponent.js:516:0) at mountComponent (webpack:///~/react-dom/lib/ReactReconciler.js:46:0) at performInitialMount (webpack:///~/react-dom/lib/ReactCompositeComponent.js:371:0) at mountComponent (webpack:///~/react-dom/lib/ReactCompositeComponent.js:258:0) at mountComponent (webpack:///~/react-dom/lib/ReactReconciler.js:46:0) at mountChildren (webpack:///~/react-dom/lib/ReactMultiChild.js:238:0) (...etc...) at mountComponentIntoNode (webpack:///~/react-dom/lib/ReactMount.js:104:0) at perform (webpack:///~/react-dom/lib/Transaction.js:140:0) at batchedMountComponentIntoNode (webpack:///~/react-dom/lib/ReactMount.js:126:0) at perform (webpack:///~/react-dom/lib/Transaction.js:140:0) at batchedUpdates (webpack:///~/react-dom/lib/ReactDefaultBatchingStrategy.js:62:0) at batchedUpdates (webpack:///~/react-dom/lib/ReactUpdates.js:97:0) at _renderNewRootComponent (webpack:///~/react-dom/lib/ReactMount.js:320:0) at _renderSubtreeIntoContainer (webpack:///~/react-dom/lib/ReactMount.js:401:0) at render (webpack:///~/react-dom/lib/ReactMount.js:422:0) at (unknown) (webpack:///js/main.jsx:29:1) at callback (webpack:///js/util.js:42:3) at apply (webpack:///~/lodash/_apply.js:15:0) at wrapper (webpack:///~/lodash/_createPartial.js:38:0) at run (webpack:///~/core-js/modules/es6.promise.js:87:0) at notify/< (webpack:///~/core-js/modules/es6.promise.js:100:0) at flush (webpack:///~/core-js/modules/_microtask.js:18:0)

I don't think it's me, I'm getting this even when I just drop a demo component into my own.