diff --git a/app/code/core/Mage/Adminhtml/Block/Report/Grid.php b/app/code/core/Mage/Adminhtml/Block/Report/Grid.php
index 35002fdcdaf..15909037915 100644
--- a/app/code/core/Mage/Adminhtml/Block/Report/Grid.php
+++ b/app/code/core/Mage/Adminhtml/Block/Report/Grid.php
@@ -409,10 +409,10 @@ public function addGrandTotals($total)
             }
         }
         /*
-         * recalc totals if we have average
+         * recalculate totals if we have average
          */
         foreach ($this->getColumns() as $key => $_column) {
-            if (str_contains($_column->getTotal(), '/')) {
+            if ($_column->hasTotal() && str_contains($_column->getTotal(), '/')) {
                 list($t1, $t2) = explode('/', $_column->getTotal());
                 if ($this->getGrandTotals()->getData($t2) != 0) {
                     $this->getGrandTotals()->setData(