diff --git a/app/controllers/admin/account_activities_controller.rb b/app/controllers/admin/account_activities_controller.rb
index 0f095734f..1e1bf9196 100644
--- a/app/controllers/admin/account_activities_controller.rb
+++ b/app/controllers/admin/account_activities_controller.rb
@@ -25,10 +25,11 @@ class Admin::AccountActivitiesController < AdminController
     @account_activities = @q.result.page(params[:page]).per(params[:results_per_page])
     sort = @account_activities.orders.map(&:to_sql).join(",")
 
+    # can do here inline SQL as it's our
     if params[:page] && params[:page].to_i > 1
-      @sum = @q.result.reorder(sort).limit(@account_activities.offset_value) + @b.result.where.not(id: @q.result.map(&:id))
+      @sum = @q.result.reorder(sort).limit(@account_activities.offset_value).sum(:sum) + @b.result.where("account_activities.id NOT IN (#{@q.result.select(:id).to_sql})").sum(:sum)
     else
-      @sum = @b.result.where.not(id: @q.result.map(&:id))
+      @sum = @b.result.where("account_activities.id NOT IN (#{@q.result.select(:id).to_sql})").sum(:sum)
     end
 
     respond_to do |format|
diff --git a/app/views/admin/account_activities/index.haml b/app/views/admin/account_activities/index.haml
index 80ebba2f6..e29f12f75 100644
--- a/app/views/admin/account_activities/index.haml
+++ b/app/views/admin/account_activities/index.haml
@@ -45,7 +45,7 @@
   .col-md-3
   .col-md-2
   .col-md-4{class: 'text-right'}
-    = t(:starting_balance)  + " #{@sum.to_a.map(&:sum).sum.to_f} EUR"
+    = t(:starting_balance)  + " #{@sum.to_f} EUR"
 
 %hr
 
@@ -66,10 +66,10 @@
             %th{class: 'col-xs-2'}
               = sort_link(@q, 'sum')
         %tbody
-          -total = @sum.to_a.map(&:sum).sum.to_f
+          -total = @sum.to_f
           - @account_activities.each do |x|
             %tr
-              %td= link_to(x.account.registrar.try(:code), admin_registrar_path(x.account.registrar))
+              %td= x.account.registrar && link_to(x.account.registrar.try(:code), admin_registrar_path(x.account.registrar))
               %td= x.description.present? ? x.description : '-'
               %td= x.activity_type ? t(x.activity_type) : ''
               %td= l(x.created_at)