diff --git a/netbox_acls/forms/models.py b/netbox_acls/forms/models.py
index e034da6..c17a8d9 100644
--- a/netbox_acls/forms/models.py
+++ b/netbox_acls/forms/models.py
@@ -239,18 +239,20 @@ def clean(self):
                 host_type: [error_same_acl_name],
                 "name": [error_same_acl_name],
             }
-        if self.instance.pk:
-            # Check if Access List has no existing rules before change the Access List's type.
-            if (
+        if (
+            self.instance.pk
+            and (
                 acl_type == ACLTypeChoices.TYPE_EXTENDED
                 and self.instance.aclstandardrules.exists()
-            ) or (
+            )
+            or (
                 acl_type == ACLTypeChoices.TYPE_STANDARD
                 and self.instance.aclextendedrules.exists()
-            ):
-                error_message["type"] = [
-                    "This ACL has ACL rules associated, CANNOT change ACL type.",
-                ]
+            )
+        ):
+            error_message["type"] = [
+                "This ACL has ACL rules associated, CANNOT change ACL type.",
+            ]
 
         if error_message:
             raise forms.ValidationError(error_message)