diff --git a/app/Filament/Resources/TestingPanelReadingResource.php b/app/Filament/Resources/TestingPanelReadingResource.php
index 6c49ecc..a9126c8 100644
--- a/app/Filament/Resources/TestingPanelReadingResource.php
+++ b/app/Filament/Resources/TestingPanelReadingResource.php
@@ -813,7 +813,7 @@ class TestingPanelReadingResource extends Resource
                                 if ($plantId) {
                                     return MotorTestingMaster::whereHas('testingPanelReadings', function ($query) {
                                         $query->whereNotNull('id');
-                                    })->orderBy('subassembly_code')->pluck('subassembly_code', 'id');
+                                    })->whereNotNull('subassembly_code')->orderBy('subassembly_code')->pluck('subassembly_code', 'id');
                                 } else {
                                     return [];
                                     // return Item::whereHas('motorTestingMasters')