Cannot read property 'modals' of undefined

[manodupont]

How can we fix this issue that happens to appear everytime.

Uncaught TypeError: Cannot read property 'modals' of undefined
    at getZIndex (Modal.js:137)
    at Modal._getStyles (Modal.js:250)
    at Modal._show (Modal.js:143)
    at eval (Transition.js:140)
    at Transition.nextCallback (Transition.js:195)
    at CallbackQueue.notifyAll (CallbackQueue.js:76)
    at ReactUpdatesFlushTransaction.close (ReactUpdates.js:59)
    at ReactUpdatesFlushTransaction.closeAll (Transaction.js:206)
    at ReactUpdatesFlushTransaction.perform (Transaction.js:153)
    at ReactUpdatesFlushTransaction.perform (ReactUpdates.js:89)

thanks