diff --git a/app/controllers/admin/invoices_controller.rb b/app/controllers/admin/invoices_controller.rb
index 4fa5d26d2..82dd5e88c 100644
--- a/app/controllers/admin/invoices_controller.rb
+++ b/app/controllers/admin/invoices_controller.rb
@@ -32,6 +32,7 @@ module Admin
     end
 
     def index
+      params[:q] ||= {}
       invoices = filter_by_status
       invoices = filter_by_receipt_date(invoices)