diff --git a/app/controllers/personal_patents_controller.rb b/app/controllers/personal_patents_controller.rb
index 3affe8e..0476f33 100644
--- a/app/controllers/personal_patents_controller.rb
+++ b/app/controllers/personal_patents_controller.rb
@@ -102,7 +102,7 @@ class PersonalPatentsController < ApplicationController
                     'url' => '/' + params[:locale] + params[:url],
                     'select_text' => select_text,
                     'search_text' => search_text,
-                    'search_value' => params[:keywords].gsub(/\"/,''),
+                    'search_value' => params[:keywords].to_s.gsub(/\"/,''),
                     'csrf_value' => csrf_value },
       'headers' => headers,
       'total_pages' => patents_total_pages,