diff --git a/probeCOCOATek/probeCOCOATek.py b/probeCOCOATek/probeCOCOATek.py
index a569e9e..518398c 100755
--- a/probeCOCOATek/probeCOCOATek.py
+++ b/probeCOCOATek/probeCOCOATek.py
@@ -1,7 +1,5 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
-if sys.version_info.major == 3 and sys.version_info.minor >= 7:
-    from __future__ import annotations
 import sys
 import os
 import io
@@ -17,7 +15,6 @@
 from probeCOCOATek import __version__
 from probeCOCOATek.TemporaryExposureKey.TemporaryExposureKey_pb2 import TemporaryExposureKeyExport
 
-
 class Error(Exception):
   pass
 class AugumentError(Error):
@@ -102,7 +99,7 @@ def _get_zip_file(self, filename:str) -> bytes:
         return zip_content
 
 
-    def _extract_key_zip(self, zip_content:bytes) -> tuple(bytes, bytes):
+    def _extract_key_zip(self, zip_content:bytes) -> (bytes, bytes):
         try:
             z = zipfile.ZipFile(io.BytesIO(zip_content))
         except zipfile.BadZipFile as e:
@@ -116,7 +113,7 @@ def _parse_export_key(self, pb_bin:bytes) -> TemporaryExposureKeyExport:
             tek_bin.ParseFromString(pb_bin)
         except pbm.DecodeError as e:
             #print('DecodeError: {}'.format(e))
-            None
+            pass
         except Exception as e:
             print('Error: {}'.format(e))
         return tek_bin