app/Filament/Resources/WireMasterPackingResource/Pages/CreateWireMasterPacking.php

@@ -250,7 +250,8 @@ class CreateWireMasterPacking extends CreateRecord
         $alreadyScannedQty = WireMasterPacking::where('customer_po_master_id', $customerPo)
             ->where('plant_id', $plantId)
             ->where('item_id', $itemId)
-            ->sum('weight');
+            ->selectRaw('SUM(CAST(weight AS NUMERIC)) as total_weight')
+            ->value('total_weight');
 
         $totalQty = (float)$alreadyScannedQty + (float)$weight;