diff --git a/app/mainwindow.py b/app/mainwindow.py
index 7285623..3aca97c 100644
--- a/app/mainwindow.py
+++ b/app/mainwindow.py
@@ -7,10 +7,10 @@ from decimal import Decimal
 from PyQt5.QtCore import Qt, QThread, pyqtSignal, QDate
 from .tools import get_icon, to_float, to_numeric
 from .dialogs import (Help, SearchSale, SearchParty, SearchProduct, Position,
-                        Comment, DialogPayment, DialogSalesman, DialogVoucher, DialogPrintInvoice,
-                        DialogGlobalDiscount, DialogPaymentTerm, DialogStock, DialogOrder,
-                        DialogForceAssign, DialogTaxes, DialogCancelInvoice, SaleLine, DialogAgent,
-                        DialogConsumer, DialogManageTables)
+    Comment, DialogPayment, DialogSalesman, DialogVoucher, DialogPrintInvoice,
+    DialogGlobalDiscount, DialogPaymentTerm, DialogStock, DialogOrder,
+    DialogForceAssign, DialogTaxes, DialogCancelInvoice, SaleLine, DialogAgent,
+    DialogConsumer, DialogManageTables)
 from datetime import datetime, timedelta, date
 from collections import OrderedDict
 # from PyQt5.QtGui import QTouchEvent
@@ -1882,13 +1882,14 @@ class MainWindow(FrontWindow):
         self._current_line_id = res['id']
         self.add_sale_line(res)
         self._sale_line['product'] = product
-        print(product)
         self._products[product['id']] = product
 
         self.update_total_amount()
         self.set_state('add')
 
     def _check_stock_quantity(self, product, request_qty=None):
+        if not isinstance(product['quantity'], (str, int, float, Decimal)):
+            return True
         qty_ = Decimal(product['quantity'])
         if self._password_admin:
             if (request_qty and qty_ < request_qty) or (qty_ <= 0):
diff --git a/app/proxy.py b/app/proxy.py
index d12a822..af8b6b7 100644
--- a/app/proxy.py
+++ b/app/proxy.py
@@ -82,7 +82,10 @@ class FastModel(object):
         route = self.get_route('model_method')
         data = json.dumps(args_, default=encoder)
         res = requests.post(route, data=data)
-        data = res.json()
+        try:
+            data = res.json()
+        except ValueError:
+            print(res.text)
         return data