diff --git a/src/command_modules/azure-cli-network/HISTORY.rst b/src/command_modules/azure-cli-network/HISTORY.rst
index 21641017f5d..af3263cdf6d 100644
--- a/src/command_modules/azure-cli-network/HISTORY.rst
+++ b/src/command_modules/azure-cli-network/HISTORY.rst
@@ -5,6 +5,7 @@ Release History
 
 2.2.10
 ++++++
+* `dns zone update`: Finished issue where using "" to clear resolution and registration VNets didn't work.
 * `application-gateway waf-config set`: Added `--exclusion` argument to support WAF exclusions.
 
 2.2.9
diff --git a/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_validators.py b/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_validators.py
index dae5446b450..93b8a824ccf 100644
--- a/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_validators.py
+++ b/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_validators.py
@@ -60,8 +60,8 @@ def _validate_vnet_name_or_id(cmd, namespace):
         names_or_ids = getattr(namespace, dest)
         ids = []
 
-        if names_or_ids == [""] or not names_or_ids:
-            names_or_ids = []
+        if names_or_ids == [''] or not names_or_ids:
+            return
 
         for val in names_or_ids:
             if not is_valid_resource_id(val):
diff --git a/src/command_modules/azure-cli-network/azure/cli/command_modules/network/custom.py b/src/command_modules/azure-cli-network/azure/cli/command_modules/network/custom.py
index 2e761c258cd..916ae8a89c7 100644
--- a/src/command_modules/azure-cli-network/azure/cli/command_modules/network/custom.py
+++ b/src/command_modules/azure-cli-network/azure/cli/command_modules/network/custom.py
@@ -6,11 +6,11 @@
 
 from collections import Counter, OrderedDict
 
-from knack.log import get_logger
-
 from msrestazure.azure_exceptions import CloudError
 from msrestazure.tools import parse_resource_id, is_valid_resource_id, resource_id
 
+from knack.log import get_logger
+
 from azure.mgmt.trafficmanager.models import MonitorProtocol, ProfileStatus
 
 # pylint: disable=no-self-use,no-member,too-many-lines,unused-argument
@@ -967,7 +967,6 @@ def update_dns_zone(instance, tags=None, zone_type=None, resolution_vnets=None,
         instance.registration_virtual_networks = None
     elif registration_vnets:
         instance.registration_virtual_networks = registration_vnets
-
     return instance