diff --git a/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScroller.kt b/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScroller.kt
index eee187a85..9086f50db 100644
--- a/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScroller.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScroller.kt
@@ -103,9 +103,7 @@ class FastScroller : LinearLayout {
         @IdRes val recyclerViewId = mRecyclerView?.id ?: View.NO_ID
         val marginTop = resources.getDimensionPixelSize(R.dimen.fastscroll_scrollbar_margin_top)
         val marginBottom = resources.getDimensionPixelSize(R.dimen.fastscroll_scrollbar_margin_bottom)
-        if (recyclerViewId == View.NO_ID) {
-            throw IllegalArgumentException("RecyclerView must have a view ID")
-        }
+        require(recyclerViewId != View.NO_ID) { "RecyclerView must have a view ID" }
         when (viewGroup) {
             is ConstraintLayout -> {
                 val constraintSet = ConstraintSet()
diff --git a/app/src/main/res/layout/view_fastscroller.xml b/app/src/main/res/layout/view_fastscroller.xml
index 7256c640f..d2c3b71d5 100644
--- a/app/src/main/res/layout/view_fastscroller.xml
+++ b/app/src/main/res/layout/view_fastscroller.xml
@@ -21,10 +21,6 @@
         android:id="@+id/fastscroll_scrollbar"
         android:layout_width="wrap_content"
         android:layout_height="match_parent"
-        android:paddingEnd="@dimen/fastscroll_scrollbar_padding_end"
-        android:paddingLeft="@dimen/fastscroll_scrollbar_padding_start"
-        android:paddingRight="@dimen/fastscroll_scrollbar_padding_end"
-        android:paddingStart="@dimen/fastscroll_scrollbar_padding_start"
         android:visibility="gone"
         tools:visibility="visible">
 
@@ -41,6 +37,8 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="center_horizontal"
+            android:paddingEnd="@dimen/fastscroll_scrollbar_padding_end"
+            android:paddingStart="@dimen/fastscroll_scrollbar_padding_start"
             tools:ignore="ContentDescription"
             tools:src="@drawable/fastscroll_handle" />