diff --git a/app/Http/Controllers/Dashboard/Product/Controller.php b/app/Http/Controllers/Dashboard/Product/Controller.php
index 466e815..3c539c2 100755
--- a/app/Http/Controllers/Dashboard/Product/Controller.php
+++ b/app/Http/Controllers/Dashboard/Product/Controller.php
@@ -154,6 +154,12 @@ class Controller extends ExController
     {
         $category = Category::find($id);
 
+        if (empty($category)) {
+            return [
+                'status' => false,
+                'characteristics' => []
+            ];
+        }
 
         if (!empty($category->characteristics) && count($category->characteristics) > 0) {
             $characteristics = $category->characteristics;
diff --git a/app/Http/Requests/Dashboard/Product/Store.php b/app/Http/Requests/Dashboard/Product/Store.php
index d7a9fbf..5ea3fdc 100755
--- a/app/Http/Requests/Dashboard/Product/Store.php
+++ b/app/Http/Requests/Dashboard/Product/Store.php
@@ -38,7 +38,7 @@ class Store extends FormRequest
             'brand_id' => 'required',
             'measurement_id' => 'nullable|exists:measurements,id',
 
-            'category_id' => 'required',
+            'category_id' => 'required|integer|exists:categories,id',
             'colors' => 'array|required',
             'colors.*.color_id' => 'nullable',
             'colors.*.sizes' => 'nullable|array',
diff --git a/app/Http/Requests/Dashboard/Product/Update.php b/app/Http/Requests/Dashboard/Product/Update.php
index c30595e..a5d354b 100755
--- a/app/Http/Requests/Dashboard/Product/Update.php
+++ b/app/Http/Requests/Dashboard/Product/Update.php
@@ -28,7 +28,7 @@ class Update extends FormRequest
             'price' => 'required|numeric',
             'price_discount' => 'nullable',
             'brand_id' => 'required',
-            'category_id' => 'required',
+            'category_id' => 'required|integer|exists:categories,id',
             'popular' => 'nullable',
             "calc" => [],
             'leader_of_sales' => 'nullable',
diff --git a/app/Jobs/Dashboard/Product/Update.php b/app/Jobs/Dashboard/Product/Update.php
index b632de9..bbbc9c0 100755
--- a/app/Jobs/Dashboard/Product/Update.php
+++ b/app/Jobs/Dashboard/Product/Update.php
@@ -58,13 +58,6 @@ class Update
 
     private function syncCategories()
     {
-        $cats = $this->product->categories()->get();
-
-        $cats = array_map(function ($cat) {
-            return $cat['id'];
-        }, $cats->toArray());
-
-        $this->product->categories()->detach($cats);
-        $this->product->categories()->attach([$this->request->getCategoryID()]);
+        $this->product->categories()->sync([$this->request->getCategoryID()]);
     }
 }
diff --git a/resources/js/components/ProductEdit.vue b/resources/js/components/ProductEdit.vue
index 59ae94a..da1fc65 100755
--- a/resources/js/components/ProductEdit.vue
+++ b/resources/js/components/ProductEdit.vue
@@ -1033,7 +1033,9 @@ export default {
 
     watch: {
         "products.category_id": function (newVal) {
-            this.getCharacteristics(newVal);
+            if (newVal) {
+                this.getCharacteristics(newVal);
+            }
         },
 
         "category.first": function (newVal) {
@@ -1050,8 +1052,8 @@ export default {
                     this.DetectCategoryTwo();
                 } else {
                     if (newVal.id) {
-                        this.product.category_id = newVal.id;
-                        this.getCharacteristics(newVal);
+                        this.products.category_id = newVal.id;
+                        this.getCharacteristics(newVal.id);
                     }
                 }
             }
@@ -1178,7 +1180,7 @@ export default {
                 this.category.two_view = true;
             } else {
                 this.getCharacteristics(this.category.first.id);
-                this.product.category_id = this.category.first.id;
+                this.products.category_id = this.category.first.id;
             }
         },
 
@@ -1197,6 +1199,13 @@ export default {
         },
 
         async getCharacteristics(id) {
+            id = id && id.id ? id.id : id;
+
+            if (!id) {
+                this.characteristics = [];
+                return;
+            }
+
             const { data } = await axios.get(
                 "/dashboard/products/characteristics/" + id
             );