diff --git a/app/Filament/Imports/MotorTestingMasterImporter.php b/app/Filament/Imports/MotorTestingMasterImporter.php
index ee0d296..4383944 100644
--- a/app/Filament/Imports/MotorTestingMasterImporter.php
+++ b/app/Filament/Imports/MotorTestingMasterImporter.php
@@ -274,7 +274,7 @@ class MotorTestingMasterImporter extends Importer
             $warnMsg[] = 'Invalid plant code found';
         } elseif (Str::length($iCode) < 6 || ! ctype_alnum($iCode)) {
             $warnMsg[] = 'Invalid item code found';
-        } elseif (Str::length($sCode) < 6 || ! ctype_alnum($sCode)) {
+        } elseif (Str::length($sCode) > 0 && (Str::length($sCode) < 6 || ! ctype_alnum($sCode))) {
             $warnMsg[] = 'Invalid sub-assembly code found';
         } else {
             $plant = Plant::where('code', $plantCod)->first();