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-rw-r--r--src/cryptography/x509.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/cryptography/x509.py b/src/cryptography/x509.py
index 173fd084..b0a4a352 100644
--- a/src/cryptography/x509.py
+++ b/src/cryptography/x509.py
@@ -568,11 +568,11 @@ class UserNotice(object):
class NoticeReference(object):
def __init__(self, organization, notice_numbers):
self._organization = organization
- if notice_numbers and not all(
+ if not isinstance(notice_numbers, list) or not all(
isinstance(x, int) for x in notice_numbers
):
raise TypeError(
- "notice_numbers must be a list of integers or None"
+ "notice_numbers must be a list of integers"
)
self._notice_numbers = notice_numbers