crash on fast page swipe grab

[rursache]

hello, the app crashes on the following lines:

// cancel transition in case of changing direction
            if (translation.x > 0 && animationDirectionInteractive != .right) || (translation.x < 0 && animationDirectionInteractive != .left) {
                interactiveTransitionInProgress = false
                finishTransition(isCancelled: true)
            }

with error:

2017-09-29 19:22:38.868030+0300 APP[7739:1446562] refreshPreferences: ActivationLoggingEnabled: 0 ActivationLoggingTaskedOffByDA:0
fatal error: unexpectedly found nil while unwrapping an Optional value
2017-09-29 19:23:10.943729+0300 APP[7739:1446562] fatal error: unexpectedly found nil while unwrapping an Optional value

you can reproduce this by including a scrollview in a viewcontroller then add it to swiftypagecontroller. swipe thought the scrollview fast and you'll catch the crash

[rursache]

you can use

if (animationDirectionInteractive == nil) {
       return
}

above the code where is crashing until an official fix

[alkhokhlov]

Fixed. Thanks