From 9b01d76c40c67776e232350c35a7aaeba217a88d Mon Sep 17 00:00:00 2001
From: nvmbrasserie <ivan@opensanctions.org>
Date: Thu, 21 Nov 2024 12:16:31 +0100
Subject: [PATCH] isinstance upd

---
 stdnum/ru/ogrn.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stdnum/ru/ogrn.py b/stdnum/ru/ogrn.py
index 12e411b5..da0dd627 100644
--- a/stdnum/ru/ogrn.py
+++ b/stdnum/ru/ogrn.py
@@ -71,7 +71,7 @@ def validate(text):
 
 def format(text):
     """Normalize the given string to a valid OGRN."""
-    if not isinstance(text):
+    if not isinstance(text, str):
         return None
     match = re.compile(r'\b(\d{13}|\d{15})\b').search(text)
     if match is None: