diff --git a/lib/models/arguments.rb b/lib/models/arguments.rb
index b7ff4e0..e85915d 100644
--- a/lib/models/arguments.rb
+++ b/lib/models/arguments.rb
@@ -19,11 +19,11 @@ class Arguments
   end
 
   def to_output
-    arguments = @args.to_a
-    return if arguments.blank?
-
+    arguments = @args.to_a || []
     arguments.concat(["--custom-transformers", *@custom_transformers]) if @custom_transformers.length.positive?
 
+    return if arguments.blank?
+
     rng = Random.new
     variable_names = Set.new