diff --git a/app/controllers/registrar/invoices_controller.rb b/app/controllers/registrar/invoices_controller.rb
index b33a315fd..23af8ab77 100644
--- a/app/controllers/registrar/invoices_controller.rb
+++ b/app/controllers/registrar/invoices_controller.rb
@@ -6,8 +6,8 @@ class Registrar::InvoicesController < RegistrarController
   def index
     params[:q] ||= {}
     invoices = current_user.registrar.invoices.includes(:invoice_items, :account_activity)
-    params[:q][:sum_cache_gteq].gsub!(',', '.')
-    params[:q][:sum_cache_lteq].gsub!(',', '.')
+    params[:q][:sum_cache_gteq].gsub!(',', '.') if params[:q][:sum_cache_gteq]
+    params[:q][:sum_cache_lteq].gsub!(',', '.') if params[:q][:sum_cache_lteq]
     @q = invoices.search(params[:q])
     @q.sorts  = 'id desc' if @q.sorts.empty?
     @invoices = @q.result.page(params[:page])