diff --git a/alkatorapi/models.py b/alkatorapi/models.py
index 527d6a9..fd4e812 100644
--- a/alkatorapi/models.py
+++ b/alkatorapi/models.py
@@ -83,7 +83,7 @@ class Cart(models.Model):
 
 class CartProduct(models.Model):
     product = models.ForeignKey(Product, on_delete=models.RESTRICT)
-    cart = models.ForeignKey('Cart', on_delete=models.RESTRICT)
+    cart = models.ForeignKey('Cart', on_delete=models.CASCADE)
     class Meta:
         unique_together = ('product', 'cart')
     quantity = models.IntegerField()
diff --git a/alkatorapi/views.py b/alkatorapi/views.py
index 5c81561..32247e1 100644
--- a/alkatorapi/views.py
+++ b/alkatorapi/views.py
@@ -427,11 +427,13 @@ def cart_buy(request):
     result = parse_qs(result.text)
 
     if result['code'][0] != '0':
-        racer.delete()
+        for ip in InvoiceProduct.objects.filter(invoice=invoice):
+            ip.delete()
         invoice.delete()
         return HttpResponse('{"reason":"Chyba na straně platební brány: ' + result['message'][0] + ', zkuste prosím nákup později."}', status=400, content_type='application/json')
 
     invoice.trans_id = result['transId'][0]
+    cart.delete()
     invoice.save()
 
     return HttpResponse('{"success":"", "redirect":"' + result['redirect'][0] + '"}', content_type='application/json')
diff --git a/frontend/src/scripts/index.js b/frontend/src/scripts/index.js
index 82a33d4..a84700f 100644
--- a/frontend/src/scripts/index.js
+++ b/frontend/src/scripts/index.js
@@ -338,7 +338,7 @@ class Main extends Component {
                     <td>Celkem</td>
                     <td></td>
                     <td>{this.calculateTotalPrice()} Kč</td>
-                    <td><form action='/api/cart/buy' onSubmit={(e) => this.onSubmit(e)}><button type="submit">Koupit</button></form></td>
+                    <td><form id="form" action='/api/cart/buy' onSubmit={(e) => this.onSubmit(e)}><button class="btn btn-primary" type="submit">Koupit</button></form></td>
                 </tr>
             </tbody>
         </table>