diff --git a/cdmm/app/controllers/cdmm_controller.rb b/cdmm/app/controllers/cdmm_controller.rb
index 01a58b4..b0d3892 100644
--- a/cdmm/app/controllers/cdmm_controller.rb
+++ b/cdmm/app/controllers/cdmm_controller.rb
@@ -14,7 +14,7 @@ def show()
 
     def save()
         form_key = params[:form_key]
-        if form_key == ""
+        unless params[:form_key] or params[:form_key].present?
             form_key = generate_unique_form_key
             ev = Evaluation.new(evaluation_params.merge(form_key: form_key))
         else