diff --git a/app/Models/GoodPool.php b/app/Models/GoodPool.php
index 269d17f0..ad271494 100755
--- a/app/Models/GoodPool.php
+++ b/app/Models/GoodPool.php
@@ -30,7 +30,13 @@ class GoodPool extends Model
     
     public static function _rand($sClass)
     {
-        $aGood = self::where("class", $sClass)->get()->toArray();
+        $oGood = self::where("class", $sClass)->get();
+        
+        if ($oGood->isEmpty()) {
+            return [];
+        }
+        
+        $aGood = $oGood->toArray();
         
         $iGoodRandKey = array_rand($aGood);