material-ui-pickers: Warning: Failed prop type: Invalid prop `transKey` of type `object` supplied to `SlideTransition`, expected `string`.

Environment

Tech	Version
material-ui-pickers	1.0.0-rc.13
material-ui	1.5.1
React	16.4.2
Browser	Chrome 68.0.3440.106 64bit
Platform	Windows 10 client pc, linux centos server
Peer library	Moment 2.22.2
babel	@babel/runtime 7.0.0-beta.54 and 55

Steps to reproduce

1. Copied date picker code for keyboard input
2. Load site and clicked on the icon button.
3. The warning appears only once. At every refresh.
4. Note: this doesn’t occur if I pass openToYearSelection to true.

Expected behavior

No warnings.

Actual behavior

Warning: Failed prop type: Invalid prop `transKey` of type `object` supplied to `SlideTransition`, expected `string`.
    in SlideTransition (created by WithStyles(SlideTransition))
    in WithStyles(SlideTransition) (created by CalendarHeader)
    in div (created by CalendarHeader)
    in div (created by CalendarHeader)
    in CalendarHeader
    in WithUtils(CalendarHeader) (created by WithStyles(WithUtils(CalendarHeader)))
    in WithStyles(WithUtils(CalendarHeader)) (created by Calendar)
    in Calendar
    in WithUtils(Calendar) (created by WithStyles(WithUtils(Calendar)))
    in WithStyles(WithUtils(Calendar)) (created by DatePicker)
    in DatePicker
    in WithUtils(DatePicker) (created by RenderPropsComponent)
    in div (created by DialogContent)
    in DialogContent (created by WithStyles(DialogContent))
    in WithStyles(DialogContent) (created by ModalDialog)
    in div (created by Paper)
    in Paper (created by WithStyles(Paper))
    in WithStyles(Paper) (created by Dialog)
    in Transition (created by Fade)
    in Fade (created by WithTheme(Fade))
    in WithTheme(Fade) (created by Dialog)
    in RootRef (created by Modal)
    in div (created by Modal)
    in Portal (created by Modal)
    in Modal (created by WithStyles(Modal))
    in WithStyles(Modal) (created by Dialog)
    in Dialog (created by WithStyles(Dialog))
    in WithStyles(Dialog) (created by ModalDialog)
    in ModalDialog (created by WithStyles(ModalDialog))
    in WithStyles(ModalDialog) (created by ModalWrapper)
    in ModalWrapper (created by RenderPropsComponent)
    in RenderPropsComponent (created by withHandlers(RenderPropsComponent))
    in withHandlers(RenderPropsComponent) (created by lifecycle(withHandlers(RenderPropsComponent)))
    in lifecycle(withHandlers(RenderPropsComponent)) (created by withState(lifecycle(withHandlers(RenderPropsComponent))))
    in withState(lifecycle(withHandlers(RenderPropsComponent))) (created by BasePicker)
    in BasePicker
    in WithUtils(BasePicker) (created by DatePickerWrapper)
    in DatePickerWrapper (created by ForwardRef)
    in div (created by PageHome)
    in PageHome (created by Route)
    in div (created by Mutation)
    in div (created by Mutation)
    in div (created by Mutation)
    in Mutation (created by CompNav)
    in CompNav (created by WithStyles(CompNav))
    in WithStyles(CompNav) (created by WithTheme(WithStyles(CompNav)))
    in WithTheme(WithStyles(CompNav)) (created by Connect(WithTheme(WithStyles(CompNav))))
    in Connect(WithTheme(WithStyles(CompNav))) (created by Route)
    in Route (created by withRouter(Connect(WithTheme(WithStyles(CompNav)))))
    in withRouter(Connect(WithTheme(WithStyles(CompNav)))) (created by withCookies(Component))
    in withCookies(Component) (created by Route)
    in div (created by Route)
    in Transition (created by Fade)
    in Fade (created by WithTheme(Fade))
    in WithTheme(Fade) (created by Route)
    in Route (created by PrivateRoute)
    in PrivateRoute (created by AppRoutes)
    in Switch (created by AppRoutes)
    in AppRoutes (created by Route)
    in Route (created by withRouter(AppRoutes))
    in withRouter(AppRoutes)
    in App (created by WithRoot)
    in MuiPickersUtilsProvider (created by WithRoot)
    in MuiThemeProvider (created by WithRoot)
    in WithRoot (created by Query)
    in Query (created by Apollo(WithRoot))
    in Apollo(WithRoot) (created by Connect(Apollo(WithRoot)))
    in Connect(Apollo(WithRoot)) (created by Route)
    in Route (created by withRouter(Connect(Apollo(WithRoot))))
    in withRouter(Connect(Apollo(WithRoot)))
    in I18nextProvider
    in CookiesProvider
    in Router (created by ConnectedRouter)
    in ConnectedRouter
    in ApolloProvider
    in Provider
    in Provider

Live example

https://codesandbox.io/s/v3n19r93z3