diff --git a/app/adminapi/validate/material/MaterialValidate.php b/app/adminapi/validate/material/MaterialValidate.php
index 5628becf7..82011f93f 100644
--- a/app/adminapi/validate/material/MaterialValidate.php
+++ b/app/adminapi/validate/material/MaterialValidate.php
@@ -118,6 +118,7 @@
 		
 		public function checkSecondLevel($value, $rule, $data): bool|string
 		{
+			if (empty($value)) return true;
 			$classify = MaterialClassify::where('id', $value)->where('pid', $data['first_level'])->findOrEmpty();
 			if ($classify->isEmpty()) {
 				return '材料中类不存在';
@@ -127,6 +128,7 @@
 		
 		public function checkThreeLevel($value, $rule, $data): bool|string
 		{
+			if (empty($value)) return true;
 			$classify = MaterialClassify::where('id', $value)->where('pid', $data['second_level'])->findOrEmpty();
 			if ($classify->isEmpty()) {
 				return '材料小类不存在';