Attempted fix of issue 91

Author: turing-tech

lib/build.gradle

@@ -1,7 +1,7 @@
 apply plugin: 'com.android.library'
 //apply plugin: 'kotlin-android'
 
-def libVersion = '13.2.5'
+def libVersion = '13.2.6'
 
 android {
     compileSdkVersion 27

lib/src/main/java/com/turingtechnologies/materialscrollbar/ScrollingUtilities.java

@@ -126,8 +126,10 @@ int scrollToPositionAtProgress(float touchFraction) {
             //If the position we wish to scroll to is, say, position 10.5, we scroll to position 10,
             //and then offset by 0.5 * rowHeight. This is how we achieve smooth scrolling.
             LinearLayoutManager layoutManager = ((LinearLayoutManager) materialScrollBar.recyclerView.getLayoutManager());
-            layoutManager.scrollToPositionWithOffset(spanCount * exactItemPos / scrollPosState.rowHeight,
-                    -(exactItemPos % scrollPosState.rowHeight));
+            try {
+                layoutManager.scrollToPositionWithOffset(spanCount * exactItemPos / scrollPosState.rowHeight,
+                        -(exactItemPos % scrollPosState.rowHeight));
+            } catch (ArithmeticException e) { /* Avoids issues where children of RV have not yet been laid out */ }
         } else {
             if(layoutManager == null) {
                 layoutManager = ((LinearLayoutManager) materialScrollBar.recyclerView.getLayoutManager());