Uncaught TypeError: Cannot read property 'slideHandler' of undefined

I install:

```
"react-slick": "^0.25.2",
"slick-carousel": "^1.8.1"
```

in auto play or when I click next I get this exception:

```
inner-slider.js:479 Uncaught TypeError: Cannot read property 'slideHandler' of undefined
at InnerSlider. (inner-slider.js:479)
at callCallback (react-dom.development.js:12490)
at commitUpdateQueue (react-dom.development.js:12511)
at commitLifeCycles (react-dom.development.js:19858)
at commitLayoutEffects (react-dom.development.js:22803)
at HTMLUnknownElement.callCallback (react-dom.development.js:188)
at Object.invokeGuardedCallbackDev (react-dom.development.js:237)
at invokeGuardedCallback (react-dom.development.js:292)
at commitRootImpl (react-dom.development.js:22541)
at unstable_runWithPriority (scheduler.development.js:653)
at runWithPriority$1 (react-dom.development.js:11039)
at commitRoot (react-dom.development.js:22381)
at finishSyncRender (react-dom.development.js:21807)
at performSyncWorkOnRoot (react-dom.development.js:21793)
at react-dom.development.js:11089
at unstable_runWithPriority (scheduler.development.js:653)
at runWithPriority$1 (react-dom.development.js:11039)
at flushSyncCallbackQueueImpl (react-dom.development.js:11084)
at flushSyncCallbackQueue (react-dom.development.js:11072)
at scheduleUpdateOnFiber (react-dom.development.js:21199)
at Object.enqueueSetState (react-dom.development.js:12639)
at InnerSlider.dll_2adc2403d89adc16ead0../node_modules/react/cjs/react.development.js.Component.setState (react.development.js:471)
at InnerSlider.slideHandler (inner-slider.js:478)
at inner-slider.js:639
```

My sample code:

```

..
..
..

```