diff --git a/lib/next_ls/ast_helpers.ex b/lib/next_ls/ast_helpers.ex
index e2cef28d..c1d97b53 100644
--- a/lib/next_ls/ast_helpers.ex
+++ b/lib/next_ls/ast_helpers.ex
@@ -1,7 +1,7 @@
 defmodule NextLS.ASTHelpers do
   @moduledoc false
 
-  @spec get_attribute_reference_name(String.t(), integer(), integer()) :: String.t()
+  @spec get_attribute_reference_name(String.t(), integer(), integer()) :: String.t() | nil
   def get_attribute_reference_name(file, line, column) do
     ast = ast_from_file(file)