diff --git a/seahub/api2/views.py b/seahub/api2/views.py
index ab50e38e621..0cf6f23ab8a 100644
--- a/seahub/api2/views.py
+++ b/seahub/api2/views.py
@@ -3379,8 +3379,6 @@ def get(self, request, repo_id, current_revision_id, format=None):
         try:
             next_file_history = get_next_file_history(repo_id, path, current_revision_id)
         except Exception as e:
-            print('**********')
-            print(e)
             next_file_history = {}
 
         commit_id = next_file_history.get('commit_id', '')
@@ -3388,7 +3386,7 @@ def get(self, request, repo_id, current_revision_id, format=None):
         file_name = os.path.basename(path)
 
         if not commit_id:
-            return Response('')
+            return api_error(status.HTTP_404_NOT_FOUND, 'Revision commit_id not found.')
 
         try:
             obj_id = seafserv_threaded_rpc.get_file_id_by_commit_and_path(
diff --git a/seahub/seadoc/apis.py b/seahub/seadoc/apis.py
index f2c88b8c73e..d33c28ca142 100644
--- a/seahub/seadoc/apis.py
+++ b/seahub/seadoc/apis.py
@@ -754,8 +754,6 @@ def get(self, request, file_uuid):
             error_msg = 'op_date invalid.'
             return api_error(status.HTTP_400_BAD_REQUEST, error_msg)
 
-        to_tz = request.GET.get('to_tz', TO_TZ)
-
         try:
             file_revisions = get_file_daily_history_detail(repo_id, path, start_time, end_time, to_tz)
         except Exception as e: