diff --git a/lib/radiator/outline/validations.ex b/lib/radiator/outline/validations.ex
index b9e94711..3a0bed27 100644
--- a/lib/radiator/outline/validations.ex
+++ b/lib/radiator/outline/validations.ex
@@ -84,11 +84,16 @@ defmodule Radiator.Outline.Validations do
     end
   end
 
-  def validate_prev_node(%Node{uuid: id}, [%Node{prev_id: id} = node | rest_nodes], searched_nodes) do
+  def validate_prev_node(
+        %Node{uuid: id},
+        [%Node{prev_id: id} = node | rest_nodes],
+        searched_nodes
+      ) do
     validate_prev_node(node, rest_nodes ++ searched_nodes, [])
   end
 
   def validate_prev_node(%Node{}, [], []), do: :ok
+
   def validate_prev_node(%Node{} = prev_node, [node | rest_nodes], search_nodes) do
     validate_prev_node(prev_node, rest_nodes, [search_nodes | node])
   end