Null pointer exception during drag, next, prev

[edgar0011]

During swiping:

Uncaught TypeError: Cannot read property 'call' of undefined
at e.value (siema.min.js:formatted:1)
at e.value (siema.min.js:formatted:1)
at e.value (siema.min.js:formatted:1)

At Next or Prev calls:
TypeError: Cannot read property 'call' of undefined
at e.value (siema.min.js:1)
at Slider.js:82
at new Promise ()
at ProxyComponent.prev (Slider.js:75)
at slider.js:48
at HTMLUnknownElement.callCallback (react-dom.development.js:149)
at Object.invokeGuardedCallbackDev (react-dom.development.js:199)
at invokeGuardedCallback (react-dom.development.js:256)
at invokeGuardedCallbackAndCatchFirstError (react-dom.development.js:270)
at executeDispatch (react-dom.development.js:561)

[pawelgrzybek]

Can I have a CodePen / CodeSandbox example please?