From c00d5c75953c724f301b99da16b0fbeb289a5ef1 Mon Sep 17 00:00:00 2001
From: Jossef Harush <jossef12@gmail.com>
Date: Mon, 5 Oct 2020 23:52:30 +0300
Subject: [PATCH] fix(deprecations.py): fix for cases result is None

closes #423
---
 tlslite/utils/deprecations.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tlslite/utils/deprecations.py b/tlslite/utils/deprecations.py
index b5a9175c0..eaee8ab74 100644
--- a/tlslite/utils/deprecations.py
+++ b/tlslite/utils/deprecations.py
@@ -41,7 +41,7 @@ def _func(*args, **kwargs):
                     # isinstance(old_name(), new_name) to work
                     frame = inspect.currentframe().f_back
                     code = inspect.getframeinfo(frame).code_context
-                    if [line for line in code
+                    if code and [line for line in code
                             if '{0}('.format(old_name) in line]:
                         _warn()
                 else: