diff --git a/netbox/ipam/forms/model_forms.py b/netbox/ipam/forms/model_forms.py
index f1b165838..17e66fa34 100644
--- a/netbox/ipam/forms/model_forms.py
+++ b/netbox/ipam/forms/model_forms.py
@@ -369,17 +369,18 @@ class IPAddressForm(TenancyForm, NetBoxModelForm):
                 'primary_for_parent', _("Only IP addresses assigned to an interface can be designated as primary IPs.")
             )
 
-        prev_interface = self.instance.interface.first() or self.instance.vminterface.first()
-        # If the prev interface exists and does not match the new interface, we need to validate it isn't set as primary
-        # for the parent
-        if prev_interface and prev_interface != interface:
-            prev_parent = prev_interface.device or prev_interface.virtual_machine
-            # Check that the parent exists and if it is set as a primary ip.
-            if prev_parent and prev_parent.primary_ip4 == self.instance or prev_parent.primary_ip6 == self.instance:
-                self.add_error(
-                    selected_objects[0],
-                    _("Cannot reassign IP address while it is designated as the primary IP for the parent object")
-                )
+        if self.instance.pk:
+            prev_interface = self.instance.interface.first() or self.instance.vminterface.first()
+            # If the prev interface exists and does not match the new interface, we need to validate it isn't set as primary
+            # for the parent
+            if prev_interface and prev_interface != interface:
+                prev_parent = prev_interface.device or prev_interface.virtual_machine
+                # Check that the parent exists and if it is set as a primary ip.
+                if prev_parent and prev_parent.primary_ip4 == self.instance or prev_parent.primary_ip6 == self.instance:
+                    self.add_error(
+                        selected_objects[0],
+                        _("Cannot reassign IP address while it is designated as the primary IP for the parent object")
+                    )
 
         # Do not allow assigning a network ID or broadcast address to an interface.
         if interface and (address := self.cleaned_data.get('address')):