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-rw-r--r--ipalib/util.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/ipalib/util.py b/ipalib/util.py
index 81c0e9e5e..1c354b633 100644
--- a/ipalib/util.py
+++ b/ipalib/util.py
@@ -600,7 +600,7 @@ def _resolve_record(owner, rtype, nameserver_ip=None, edns0=False,
:param flag_cd: requires dnssec=True, adds flag CD
:raise DNSException: if error occurs
"""
- assert isinstance(nameserver_ip, six.string_types)
+ assert isinstance(nameserver_ip, six.string_types) or nameserver_ip is None
assert isinstance(rtype, six.string_types)
res = dns.resolver.Resolver()