diff --git a/app/cron/alert_low_stock.php b/app/cron/alert_low_stock.php
index a2e93b1..7fb099d 100644
--- a/app/cron/alert_low_stock.php
+++ b/app/cron/alert_low_stock.php
@@ -8,16 +8,21 @@ require __DIR__ . '/../assets/utils/cron_auth.php';
 
 $sth = $pdo2->query(
     "SELECT e.company_id, COUNT(*) AS count
-     FROM etl_stock_summary e
-     JOIN md_product p
-       ON p.product_sku = e.product_sku
-      AND p.company_id  = e.company_id
-      AND p.status      = 1
-     WHERE e.company_id > 0
-       AND p.min_stock  > 0
-       AND (e.total_in - e.total_out) < p.min_stock
-     GROUP BY e.company_id
-     HAVING count > 0"
+      FROM (
+          SELECT company_id, product_sku, SUM(total_in - total_out) AS balance
+          FROM etl_stock_summary
+          WHERE company_id > 0
+          GROUP BY company_id, product_sku
+      ) e
+      JOIN md_product p
+        ON p.sku        = e.product_sku
+      AND p.company_id = e.company_id
+      AND p.status     = 1
+      WHERE p.min_stock > 0
+        AND e.balance   < p.min_stock
+      GROUP BY e.company_id
+      HAVING count > 0"
+
 );
 
 $answer['success'] = 1;