diff --git a/src/main/java/com/ai/da/controller/AccountController.java b/src/main/java/com/ai/da/controller/AccountController.java
index 2ec5066f..03f3a9d3 100644
--- a/src/main/java/com/ai/da/controller/AccountController.java
+++ b/src/main/java/com/ai/da/controller/AccountController.java
@@ -75,7 +75,7 @@ public class AccountController {
     }
 
     @ApiOperation(value = "切换当前用户语言")
-    @PostMapping("/changeUserLanguage")
+    @GetMapping("/changeUserLanguage")
     public Response<String> changeUserLanguage(String language) {
         return Response.success(accountService.changeUserLanguage(language));
     }
diff --git a/src/main/java/com/ai/da/service/impl/LibraryServiceImpl.java b/src/main/java/com/ai/da/service/impl/LibraryServiceImpl.java
index 92f3976a..1e14e126 100644
--- a/src/main/java/com/ai/da/service/impl/LibraryServiceImpl.java
+++ b/src/main/java/com/ai/da/service/impl/LibraryServiceImpl.java
@@ -139,7 +139,9 @@ public class LibraryServiceImpl extends ServiceImpl<LibraryMapper, Library> impl
             for (Long classificationId : query.getClassificationIdList()) {
                 libraryIdList.addAll(classificationService.getLibraryIdListByClassificationId(classificationId));
             }
-            queryWrapper.lambda().in(Library::getId, libraryIdList);
+            if (CollectionUtil.isNotEmpty(libraryIdList)) {
+                queryWrapper.lambda().in(Library::getId, libraryIdList);
+            }
         }
         queryWrapper.orderByDesc("id");
         IPage<Library> page = getBaseMapper().selectPage(