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-rw-r--r--src/cryptography/hazmat/backends/openssl/backend.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py
index d30bfc29..ac025e95 100644
--- a/src/cryptography/hazmat/backends/openssl/backend.py
+++ b/src/cryptography/hazmat/backends/openssl/backend.py
@@ -235,7 +235,7 @@ def _encode_basic_constraints(backend, basic_constraints):
constraints, backend._lib.BASIC_CONSTRAINTS_free
)
constraints.ca = 255 if basic_constraints.ca else 0
- if basic_constraints.ca:
+ if basic_constraints.ca and basic_constraints.path_length is not None:
constraints.pathlen = _encode_asn1_int(
backend, basic_constraints.path_length
)