diff --git a/app/controllers/memos_controller.rb b/app/controllers/memos_controller.rb
index 08ed16723..7e9662563 100644
--- a/app/controllers/memos_controller.rb
+++ b/app/controllers/memos_controller.rb
@@ -186,7 +186,7 @@ class MemosController < ApplicationController
   end
 
   def reply
-    if params[:parent_id] || params[:memo][:parent_id]
+    if params[:memo].present? && params[:memo][:parent_id].present?
       parent = Memo.find params[:memo][:parent_id]
       @memo = params[:activity_id].blank? ? parent : Memo.find(params[:activity_id].to_i)
       @reply = Memo.new