diff --git a/app/Http/Controllers/CropController.php b/app/Http/Controllers/CropController.php
index 781562f..96fe438 100644
--- a/app/Http/Controllers/CropController.php
+++ b/app/Http/Controllers/CropController.php
@@ -67,7 +67,7 @@ class CropController extends Controller
             return $this->error('该结点有关联产量数据, 无法删除');
         }
         //如果有子节点，无法删除
-        if (Crop::where(['parent_id', $crop->id])->exists()) {
+        if (Crop::where(['parent_id' => $crop->id])->exists()) {
             return $this->error('该结点有关联产量数据, 无法删除');
         }