Random range is empty

Sometimes I get this error and the application crash

```
java.lang.IllegalArgumentException: Random range is empty: [8, -8).
at kotlin.random.RandomKt.checkRangeBounds(Random.kt:348)
at kotlin.random.Random.nextInt(Random.kt:57)
at kotlin.random.Random$Default.nextInt(Random.kt:247)
at org.firezenk.bubbleemitter.BubbleEmitterView.onDraw(BubbleEmitterView.kt:65)
at android.view.View.draw(View.java:22350)
at android.view.View.updateDisplayListIfDirty(View.java:21226)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.updateDisplayListIfDirty(View.java:21217)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.draw(View.java:22353)
at android.view.View.updateDisplayListIfDirty(View.java:21226)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.updateDisplayListIfDirty(View.java:21217)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.updateDisplayListIfDirty(View.java:21217)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.updateDisplayListIfDirty(View.java:21217)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.updateDisplayListIfDirty(View.java:21217)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.draw(View.java:22353)
at android.view.View.updateDisplayListIfDirty(View.java:21226)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.updateDisplayListIfDirty(View.java:21217)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at androidx.recyclerview.widget.RecyclerView.drawChild(RecyclerView.java:5030)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.draw(View.java:22353)
at androidx.recyclerview.widget.RecyclerView.draw(RecyclerView.java:4429)
at android.view.View.updateDisplayListIfDirty(View.java:21226)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.updateDisplayListIfDirty(View.java:21217)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.draw(View.java:22353)
at android.widget.ScrollView.draw(ScrollView.java:1833)
at android.view.View.updateDisplayListIfDirty(View.java:21226)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4277)
at android.view.View.draw(View.java:22353)
at android.view.View.updateDisplayListIfDirty(View.java:21226)
at android.view.View.draw(View.java:22081)
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4301)
at android.view.View.updateDisplayListIfDirty(View.java:21217)
at android.view.View.draw(View.java:22081)
```
at android.view.ViewGroup.drawChild(ViewGroup.java:4516)