diff --git a/netbox/ipam/models/ip.py b/netbox/ipam/models/ip.py
index 553f5eb92..af0a0ef45 100644
--- a/netbox/ipam/models/ip.py
+++ b/netbox/ipam/models/ip.py
@@ -892,7 +892,7 @@ class IPAddress(PrimaryModel):
     def is_oob_ip(self):
         if self.assigned_object:
             parent = getattr(self.assigned_object, 'parent_object', None)
-            if parent.oob_ip_id == self.pk:
+            if hasattr(parent, "oob_ip_id") and parent.oob_ip_id == self.pk:
                 return True
         return False