diff --git a/vmware_nsxlib/v3/policy/core_defs.py b/vmware_nsxlib/v3/policy/core_defs.py
index f4930f49..cc20f2b7 100644
--- a/vmware_nsxlib/v3/policy/core_defs.py
+++ b/vmware_nsxlib/v3/policy/core_defs.py
@@ -306,7 +306,7 @@ class RouterDef(ResourceDef):
         # Add dhcp relay config
         # TODO(asarfaty): this can be either dhcp or dhcp relay config
         if self.has_attr('dhcp_config'):
-            paths = None
+            paths = ""
             if self.get_attr('dhcp_config'):
                 dhcp_conf = DhcpRelayConfigDef(
                     config_id=self.get_attr('dhcp_config'),
@@ -317,7 +317,7 @@ class RouterDef(ResourceDef):
                                         value=paths)
 
         if self.has_attr('ipv6_ndra_profile_id'):
-            paths = None
+            paths = ""
             if self.get_attr('ipv6_ndra_profile_id'):
                 ndra_profile = Ipv6NdraProfileDef(
                     profile_id=self.get_attr('ipv6_ndra_profile_id'),
@@ -490,7 +490,7 @@ class Tier1InterfaceDef(ResourceDef):
                                         value=path)
 
         if self.has_attr('ipv6_ndra_profile_id'):
-            paths = None
+            paths = ""
             if self.get_attr('ipv6_ndra_profile_id'):
                 ndra_profile = Ipv6NdraProfileDef(
                     profile_id=self.get_attr('ipv6_ndra_profile_id'),
@@ -828,7 +828,7 @@ class SegmentSecProfilesBindingMapDef(SegmentBindingMapDefBase):
         body = super(SegmentSecProfilesBindingMapDef, self).get_obj_dict()
 
         if self.has_attr('segment_security_profile_id'):
-            path = None
+            path = ""
             if self.get_attr('segment_security_profile_id'):
                 profile = SegmentSecurityProfileDef(
                     profile_id=self.get_attr('segment_security_profile_id'),
@@ -840,7 +840,7 @@ class SegmentSecProfilesBindingMapDef(SegmentBindingMapDefBase):
                 value=path)
 
         if self.has_attr('spoofguard_profile_id'):
-            path = None
+            path = ""
             if self.get_attr('spoofguard_profile_id'):
                 profile = SpoofguardProfileDef(
                     profile_id=self.get_attr('spoofguard_profile_id'),
@@ -878,7 +878,7 @@ class SegmentPortSecProfilesBindingMapDef(SegmentPortBindingMapDefBase):
         body = super(SegmentPortSecProfilesBindingMapDef, self).get_obj_dict()
 
         if self.has_attr('segment_security_profile_id'):
-            path = None
+            path = ""
             if self.get_attr('segment_security_profile_id'):
                 profile = SegmentSecurityProfileDef(
                     profile_id=self.get_attr('segment_security_profile_id'),
@@ -890,7 +890,7 @@ class SegmentPortSecProfilesBindingMapDef(SegmentPortBindingMapDefBase):
                 value=path)
 
         if self.has_attr('spoofguard_profile_id'):
-            path = None
+            path = ""
             if self.get_attr('spoofguard_profile_id'):
                 profile = SpoofguardProfileDef(
                     profile_id=self.get_attr('spoofguard_profile_id'),
@@ -919,7 +919,7 @@ class SegmentPortDiscoveryProfilesBindingMapDef(SegmentPortBindingMapDefBase):
                      self).get_obj_dict()
 
         if self.has_attr('mac_discovery_profile_id'):
-            path = None
+            path = ""
             if self.get_attr('mac_discovery_profile_id'):
                 profile = MacDiscoveryProfileDef(
                     profile_id=self.get_attr('mac_discovery_profile_id'),
@@ -931,7 +931,7 @@ class SegmentPortDiscoveryProfilesBindingMapDef(SegmentPortBindingMapDefBase):
                 value=path)
 
         if self.has_attr('ip_discovery_profile_id'):
-            path = None
+            path = ""
             if self.get_attr('ip_discovery_profile_id'):
                 profile = IpDiscoveryProfileDef(
                     profile_id=self.get_attr('ip_discovery_profile_id'),
@@ -960,7 +960,7 @@ class SegmentPortQoSProfilesBindingMapDef(SegmentPortBindingMapDefBase):
                      self).get_obj_dict()
 
         if self.has_attr('qos_profile_id'):
-            path = None
+            path = ""
             if self.get_attr('qos_profile_id'):
                 profile = QosProfileDef(
                     profile_id=self.get_attr('qos_profile_id'),
diff --git a/vmware_nsxlib/v3/policy/lb_defs.py b/vmware_nsxlib/v3/policy/lb_defs.py
index c00b4222..4b9eff0b 100644
--- a/vmware_nsxlib/v3/policy/lb_defs.py
+++ b/vmware_nsxlib/v3/policy/lb_defs.py
@@ -263,7 +263,7 @@ class LBVirtualServerDef(ResourceDef):
                 app_profile_def.get_resource_full_path())
 
         if self.has_attr('lb_persistence_profile_id'):
-            path = None
+            path = ""
             lb_persistence_profile_id = self.get_attr(
                 'lb_persistence_profile_id')
             if lb_persistence_profile_id:
@@ -273,7 +273,7 @@ class LBVirtualServerDef(ResourceDef):
                 path = lb_persistence_profile_def.get_resource_full_path()
             body['lb_persistence_profile_path'] = path
         if self.has_attr('lb_service_id'):
-            path = None
+            path = ""
             lb_service_id = self.get_attr('lb_service_id')
             if lb_service_id:
                 lb_service_def = LBServiceDef(
@@ -281,7 +281,7 @@ class LBVirtualServerDef(ResourceDef):
                 path = lb_service_def.get_resource_full_path()
             body['lb_service_path'] = path
         if self.has_attr('pool_id'):
-            path = None
+            path = ""
             lb_pool_id = self.get_attr('pool_id')
             if lb_pool_id:
                 lb_pool_def = LBPoolDef(