ArrayIndexOutOfBound exception when try to enable "Dynamic overlay"

[mdfazla]

Process: com.kotlinify.cropiwa.sample, PID: 16231
java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
    at com.kotlinify.cropiwa.CropIwaDynamicOverlayView.areCornersInitialized(CropIwaDynamicOverlayView.kt:201)
    at com.kotlinify.cropiwa.CropIwaDynamicOverlayView.onDraw(CropIwaDynamicOverlayView.kt:169)
    at android.view.View.draw(View.java:21440)
    at android.view.View.buildDrawingCacheImpl(View.java:20714)
    at android.view.View.buildDrawingCache(View.java:20574)
    at android.view.View.draw(View.java:21164)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4388)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4149)
    at android.view.View.updateDisplayListIfDirty(View.java:20308)