TypeError: null is not an object (evaluating 'i.getBoundingClientRect')

[knowuh]

View details in Rollbar: https://rollbar.com/concordconsortium/Sage/items/1259/

TypeError: null is not an object (evaluating 'i.getBoundingClientRect')
  File "webpack:///./src/code/views/value-slider-view.tsx", line 279, in position
        const direction = node.getBoundingClientRect()[directionStyle];
  File "webpack:///./src/code/views/value-slider-view.tsx", line 240, in handleDrag
        const value = this.position(e);
  File "https://cdnjs.cloudflare.com/ajax/libs/rollbar.js/2.0.4/rollbar.min.js", line 1, in _wrapped
  File "[native code]", line unknown, in dispatchEvent
  File "webpack:///./src/code/vendor/touchpunch.js", line 61, in r
        event.target.dispatchEvent(simulatedEvent);
  File "webpack:///./src/code/vendor/touchpunch.js", line 108, in _touchMove
        simulateMouseEvent(event, "mousemove");
  File "webpack:///./node_modules/jquery/dist/jquery.js", line 5183, in dispatch
    						handleObj.handler ).apply( matched.elem, args );
  File "https://cdnjs.cloudflare.com/ajax/libs/rollbar.js/2.0.4/rollbar.min.js", line 1, in _wrapped