diff --git a/src/file_transfers.py b/src/file_transfers.py
index 9f4cd42..b983d81 100644
--- a/src/file_transfers.py
+++ b/src/file_transfers.py
@@ -2,6 +2,7 @@
 # TODO: add support of avatars
 from toxcore_enums_and_consts import TOX_FILE_KIND
 from os.path import basename, getsize
+from time import time
 
 
 TOX_FILE_TRANSFER_STATE = {
@@ -13,12 +14,13 @@ TOX_FILE_TRANSFER_STATE = {
 
 
 class FileTransfer(object):
-    def __init__(self, path, tox, friend_number, file_number = None):
+    def __init__(self, path, tox, friend_number, file_number=None):
         self._path = path
         self._tox = tox
         self._friend_number = friend_number
         self.state = TOX_FILE_TRANSFER_STATE['RUNNING']
         self._file_number = file_number
+        self._creation_time = time()
 
     def set_tox(self, tox):
         self._tox = tox
diff --git a/src/tox.py b/src/tox.py
index 2767660..b1fb202 100644
--- a/src/tox.py
+++ b/src/tox.py
@@ -36,7 +36,7 @@ class LibToxCore(object):
 
 
 def string_to_bin(tox_id):
-    return c_char_p(tox_id.decode('hex'))
+    return c_char_p(tox_id.decode('hex')) if tox_id is not None else None
 
 
 def bin_to_string(raw_id, length):