优化

app/src/main/java/io/legado/app/model/ReadBook.kt

@@ -90,17 +90,16 @@ object ReadBook : CoroutineScope by MainScope() {
     }
 
     fun setProgress(progress: BookProgress) {
-        if (durChapterIndex != progress.durChapterIndex
+        if (progress.durChapterIndex > chapterSize &&
-            || durChapterPos != progress.durChapterPos
+            (durChapterIndex != progress.durChapterIndex
+                || durChapterPos != progress.durChapterPos)
         ) {
-            if (progress.durChapterIndex > chapterSize) {
             durChapterIndex = progress.durChapterIndex
             durChapterPos = progress.durChapterPos
             clearTextChapter()
             loadContent(resetPageOffset = true)
         }
     }
-    }
 
     fun clearTextChapter() {
         prevTextChapter = null

app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt

@@ -220,6 +220,7 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
     }
 
     fun openChapter(index: Int, durChapterPos: Int = 0, success: (() -> Unit)? = null) {
+        if (index < ReadBook.chapterSize) {
             ReadBook.clearTextChapter()
             ReadBook.callBack?.upContent()
             if (index != ReadBook.durChapterIndex) {
@@ -231,6 +232,7 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
                 success?.invoke()
             }
         }
+    }
 
     fun removeFromBookshelf(success: (() -> Unit)?) {
         execute {