fix no chapter page error

code/app/home/controller/Novel.php

@@ -553,8 +553,13 @@ class Novel extends BaseController
         $arrChapter = $ChapterModel->getChapter($arrFilter);
 
         // 上一章节和下一章节
+        $arrPreChapter  = $arrNextChapter = [];
+
+        if ($arrChapter) {
             $arrPreChapter = $ChapterModel->getPreChapter($arrChapter['n_id'], $arrChapter['c_sort_num'], $arrChapter['c_page']);
             $arrNextChapter = $ChapterModel->getNextChapter($arrChapter['n_id'], $arrChapter['c_sort_num'], $arrChapter['c_page']);
+        }
+
 
         $arrCategoryAll = CategoryModel::$arrCategoryAll;
 
@@ -613,7 +618,6 @@ class Novel extends BaseController
         $intButtomNum = 5;
         if ($boolIsMobile == false) {
             $intButtomNum = 10;
-       
         }
 
         $strBaseUrl = sprintf('/pc/xiaoshuo/%s-%s/mulu/%s/{page}', $arrNovel['og_novel_pin_yin'], $intNId, $strOrder);