fix

app/Http/Controllers/QuickApp/Book/BookController.php

@@ -113,7 +113,7 @@ class BookController extends BaseController
     {
         $is_free = BookConfigService::judgeBookIsFree($bid);
         if ($is_free) {
-            return $is_free;
+            return true;
         }
         switch ($book_info->charge_type) {
             case 'BOOK':