Sandbox prices disappear after a few minutes

[Ashkan Kazemi]

hello all.

I'm using the Sandbox version on my website, and the weird thing that is happening is that the prices are not shown after a few minutes!!! And when this happens, if someone tries adding a product to the basket, an internal error happens.

The log in the error.log is this :

ERROR 2015-05-27 18:08:05,185 base Internal Server Error: /en-gb/basket/add/277/

Traceback (most recent call last):

  File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response

    response = wrapped_callback(request, *callback_args, **callback_kwargs)

  File "/usr/local/lib/python2.7/dist-packages/django/db/transaction.py", line 394, in inner

    return func(*args, **kwargs)

  File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/decorators.py", line 21, in _wrapped_view

    return view_func(request, *args, **kwargs)

  File "/usr/local/lib/python2.7/dist-packages/django/views/generic/base.py", line 69, in view

    return self.dispatch(request, *args, **kwargs)

  File "/usr/local/lib/python2.7/dist-packages/django/views/generic/base.py", line 87, in dispatch

    return handler(request, *args, **kwargs)

  File "/usr/local/lib/python2.7/dist-packages/oscar/apps/basket/views.py", line 304, in post

    return super(BasketAddView, self).post(request, *args, **kwargs)

  File "/usr/local/lib/python2.7/dist-packages/django/views/generic/edit.py", line 173, in post

    return self.form_valid(form)

  File "/usr/local/lib/python2.7/dist-packages/oscar/apps/basket/views.py", line 326, in form_valid

    form.cleaned_options())

  File "/usr/local/lib/python2.7/dist-packages/oscar/apps/basket/abstract_models.py", line 207, in add_product

    defaults['price_incl_tax'] = stock_info.price.incl_tax

  File "/usr/local/lib/python2.7/dist-packages/oscar/apps/partner/prices.py", line 68, in incl_tax

    return self.excl_tax + self.tax

TypeError: unsupported operand type(s) for +: 'Decimal' and 'Decimal'

But the interesting fact is, when I restart my apache (basically restart the process of application on the server), the prices are back and everything works fine!

Since I'm new to the architecture of oscar's framework, would somebody help me to see what is actually wrong? Thanks a lot in advance.