diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
index 9e584ca86..11c9dc5cf 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
@@ -256,7 +256,9 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
     }
 
     override fun upContent(position: Int) {
-        page_view.upContent(position)
+        launch {
+            page_view.upContent(position)
+        }
     }
 
     override fun upView() {
diff --git a/app/src/main/java/io/legado/app/ui/widget/page/TextChapter.kt b/app/src/main/java/io/legado/app/ui/widget/page/TextChapter.kt
index b6e18a834..fdb9e4e2b 100644
--- a/app/src/main/java/io/legado/app/ui/widget/page/TextChapter.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/page/TextChapter.kt
@@ -55,7 +55,7 @@ data class TextChapter(
     fun getReadLength(pageIndex: Int): Int {
         var length = 0
         val maxIndex = min(pageIndex, pageLines.lastIndex)
-        for (index in 0 until maxIndex) {
+        for (index in 0..maxIndex) {
             length += pageLengths[index]
         }
         return length