diff --git a/api/apps/file2document_app.py b/api/apps/file2document_app.py
index 4376a18a..7902ad23 100644
--- a/api/apps/file2document_app.py
+++ b/api/apps/file2document_app.py
@@ -45,7 +45,7 @@ def convert():
         for file_id in file_ids:
             e, file = FileService.get_by_id(file_id)
             file_ids_list = [file_id]
-            if file.type == FileType.FOLDER:
+            if file.type == FileType.FOLDER.value:
                 file_ids_list = FileService.get_all_innermost_file_ids(file_id, [])
             for id in file_ids_list:
                 informs = File2DocumentService.get_by_file_id(id)
diff --git a/api/apps/file_app.py b/api/apps/file_app.py
index 35b0b693..6cd9742d 100644
--- a/api/apps/file_app.py
+++ b/api/apps/file_app.py
@@ -64,7 +64,7 @@ def upload():
                 return get_data_error_result(
                     retmsg="Can't find this folder!")
             MAX_FILE_NUM_PER_USER = int(os.environ.get('MAX_FILE_NUM_PER_USER', 0))
-            if MAX_FILE_NUM_PER_USER > 0 and DocumentService.get_doc_count(kb.tenant_id) >= MAX_FILE_NUM_PER_USER:
+            if MAX_FILE_NUM_PER_USER > 0 and DocumentService.get_doc_count(current_user.id) >= MAX_FILE_NUM_PER_USER:
                 return get_data_error_result(
                     retmsg="Exceed the maximum file number of a free user!")
 
@@ -143,9 +143,9 @@ def create():
                 retmsg="Duplicated folder name in the same folder.")
 
         if input_file_type == FileType.FOLDER.value:
-            file_type = FileType.FOLDER
+            file_type = FileType.FOLDER.value
         else:
-            file_type = FileType.VIRTUAL
+            file_type = FileType.VIRTUAL.value
 
         file = FileService.insert({
             "id": get_uuid(),
@@ -251,7 +251,7 @@ def rm():
             if not file.tenant_id:
                 return get_data_error_result(retmsg="Tenant not found!")
 
-            if file.type == FileType.FOLDER:
+            if file.type == FileType.FOLDER.value:
                 file_id_list = FileService.get_all_innermost_file_ids(file_id, [])
                 for inner_file_id in file_id_list:
                     e, file = FileService.get_by_id(inner_file_id)
diff --git a/api/apps/user_app.py b/api/apps/user_app.py
index 79c4469f..aff6fddc 100644
--- a/api/apps/user_app.py
+++ b/api/apps/user_app.py
@@ -24,7 +24,7 @@ from api.db.db_models import TenantLLM
 from api.db.services.llm_service import TenantLLMService, LLMService
 from api.utils.api_utils import server_error_response, validate_request
 from api.utils import get_uuid, get_format_time, decrypt, download_img, current_timestamp, datetime_format
-from api.db import UserTenantRole, LLMType
+from api.db import UserTenantRole, LLMType, FileType
 from api.settings import RetCode, GITHUB_OAUTH, CHAT_MDL, EMBEDDING_MDL, ASR_MDL, IMAGE2TEXT_MDL, PARSERS, API_KEY, \
     LLM_FACTORY, LLM_BASE_URL
 from api.db.services.user_service import UserService, TenantService, UserTenantService
@@ -229,7 +229,7 @@ def user_register(user_id, user):
         "tenant_id": user_id,
         "created_by": user_id,
         "name": "/",
-        "type": FileType.FOLDER,
+        "type": FileType.FOLDER.value,
         "size": 0,
         "location": "",
     }
diff --git a/api/db/services/file_service.py b/api/db/services/file_service.py
index b99ca4c6..abb6e56c 100644
--- a/api/db/services/file_service.py
+++ b/api/db/services/file_service.py
@@ -120,7 +120,7 @@ class FileService(CommonService):
                 "name": name[count],
                 "location": "",
                 "size": 0,
-                "type": FileType.FOLDER
+                "type": FileType.FOLDER.value
             })
             return cls.create_folder(file, file.id, name, count + 1)
 
@@ -138,7 +138,23 @@ class FileService(CommonService):
     def get_root_folder(cls, tenant_id):
         file = cls.model.select().where(cls.model.tenant_id == tenant_id and
                                         cls.model.parent_id == cls.model.id)
-        e, file = cls.get_by_id(file[0].id)
+        if not file:
+            file_id = get_uuid()
+            file = {
+                "id": file_id,
+                "parent_id": file_id,
+                "tenant_id": tenant_id,
+                "created_by": tenant_id,
+                "name": "/",
+                "type": FileType.FOLDER.value,
+                "size": 0,
+                "location": "",
+            }
+            cls.save(**file)
+        else:
+            file_id = file[0].id
+
+        e, file = cls.get_by_id(file_id)
         if not e:
             raise RuntimeError("Database error (File retrieval)!")
         return file
@@ -214,12 +230,14 @@ class FileService(CommonService):
     @DB.connection_context()
     def get_folder_size(cls, folder_id):
         size = 0
+
         def dfs(parent_id):
             nonlocal size
-            for f in cls.model.select(*[cls.model.id, cls.model.size, cls.model.type]).where(cls.model.parent_id == parent_id):
+            for f in cls.model.select(*[cls.model.id, cls.model.size, cls.model.type]).where(
+                    cls.model.parent_id == parent_id, cls.model.id != parent_id):
                 size += f.size
                 if f.type == FileType.FOLDER.value:
                     dfs(f.id)
 
         dfs(folder_id)
-        return size
\ No newline at end of file
+        return size