diff --git a/app/Filament/Imports/StickerMasterImporter.php b/app/Filament/Imports/StickerMasterImporter.php
index 6d24a26..d222e13 100644
--- a/app/Filament/Imports/StickerMasterImporter.php
+++ b/app/Filament/Imports/StickerMasterImporter.php
@@ -273,8 +273,8 @@ class StickerMasterImporter extends Importer
                         if (Str::length($this->data['bundle_quantity']) > 0 && (! is_numeric($this->data['bundle_quantity']) || $this->data['bundle_quantity'] <= 1)) {
                             $warnMsg[] = "Bundle quantity must be greater than or equal to '2' or empty";
                         }
-                        if (Str::length($this->data['material_type']) > 0 && $this->data['material_type'] != '1' && $this->data['material_type'] != '2' && $this->data['material_type'] != '3') { // ($this->data['material_type'] != null) &&
-                            $warnMsg[] = 'Material type must be 1 or 2 or 3 or empty';
+                        if (Str::length($this->data['material_type']) > 0 && $this->data['material_type'] != '1' && $this->data['material_type'] != '2' && $this->data['material_type'] != '3' && $this->data['material_type'] != '4') { // ($this->data['material_type'] != null) &&
+                            $warnMsg[] = 'Material type must be 1 or 2 or 3 or 4 or empty';
                         }
 
                         if (empty($warnMsg)) {