diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index dfeffc7..342a7ae 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -17,7 +17,6 @@
         android:id="@+id/scratch_view"
         android:layout_width="300dp"
         android:layout_height="300dp"
-        app:overlay_image="@drawable/scratch_card"
         app:tile_mode="CLAMP"
         app:overlay_width="300dp"
         app:overlay_height="300dp"
diff --git a/scratchview/src/main/java/com/anupkumarpanwar/scratchview/ScratchView.java b/scratchview/src/main/java/com/anupkumarpanwar/scratchview/ScratchView.java
index 6be5597..b29da15 100644
--- a/scratchview/src/main/java/com/anupkumarpanwar/scratchview/ScratchView.java
+++ b/scratchview/src/main/java/com/anupkumarpanwar/scratchview/ScratchView.java
@@ -159,6 +159,9 @@ private void init() {
 
 
         String tileMode = arr.getString(R.styleable.ScratchView_tile_mode);
+        if (tileMode == null) {
+            tileMode = "CLAMP";
+        }
 
         Bitmap scratchBitmap = BitmapFactory.decodeResource(getResources(), overlayImage);
         scratchBitmap = Bitmap.createScaledBitmap(scratchBitmap, (int) overlayWidth, (int) overlayHeight, false);