fix bug

app/src/main/java/xyz/fycz/myreader/ui/activity/ReadActivity.java

@@ -393,7 +393,7 @@ public class ReadActivity extends BaseActivity<ActivityReadBinding> implements C
 
             @Override
             public void onLongPress() {
-                if (mSetting.getPageMode() == SCROLL){
+                if (mSetting.getPageMode() == SCROLL) {
                     ToastUtils.showWarring("滚动模式暂不支持长按复制");
                     return;
                 }
@@ -417,6 +417,9 @@ public class ReadActivity extends BaseActivity<ActivityReadBinding> implements C
                         mChapters = chapters;
                         mBook.setNoReadNum(0);
                         mBook.setChapterTotalNum(chapters.size());
+                        if (mBook.getHisttoryChapterNum() > chapters.size() - 1) {
+                            mBook.setHisttoryChapterNum(chapters.size() - 1);
+                        }
                         mBook.setNewestChapterTitle(chapters.get(chapters.size() - 1).getTitle());
                         if (hasChangeSource) {
                             boolean flag = mBookService.matchHistoryChapterPos(mBook, mChapters);
@@ -1275,7 +1278,7 @@ public class ReadActivity extends BaseActivity<ActivityReadBinding> implements C
             @Override
             public void onPageModeChange() {
                 mPageLoader.setPageMode(mSetting.getPageMode());
-                if (mSetting.getPageMode().equals(SCROLL)){
+                if (mSetting.getPageMode().equals(SCROLL)) {
                     DialogCreator.createTipDialog(ReadActivity.this,
                             "滚动模式存在大量问题，不建议使用；且作者本人不使用此模式，大概率不会进行修复/优化，也不接受此模式的问题反馈");
                 }