Exception in integral

[lidavidm]

http://www.sympygamma.com/input/?i=integrate%282x%5E2y+%2B+2y%5E2%284-x%5E2-y%5E2%29+%2B+x%284-x%5E2-y%5E2%29%2C+%28x%2C+0%2C+1%29%2C+%28y%2C+0%2C+1%29%29

If the integral is made indefinite Gamma doesn't actually evaluate it either (giving an Integral object)

There was an error in Gamma. For referencethe last five traceback entries are: Traceback (most recent call last):
  File "/base/data/home/apps/s~sympy-gamma-hrd/24.376529677133784673/app/views.py", line 278, in eval_card
    result = g.eval_card(card_name, expression, variable, parameters)
  File "/base/data/home/apps/s~sympy-gamma-hrd/24.376529677133784673/app/logic/logic.py", line 322, in eval_card
    result = card.eval(evaluator, components, parameters)
  File "/base/data/home/apps/s~sympy-gamma-hrd/24.376529677133784673/app/logic/resultsets.py", line 117, in eval
    result = card.eval(evaluator, components, parameters)
  File "/base/data/home/apps/s~sympy-gamma-hrd/24.376529677133784673/app/logic/resultsets.py", line 98, in eval
    return self.card_info['eval_method'](evaluator, components, parameters)
  File "/base/data/home/apps/s~sympy-gamma-hrd/24.376529677133784673/app/logic/resultsets.py", line 636, in eval_integral_manual
    components['variable'])
TypeError: unsupported operand type(s) for +: 'Add' and 'NoneType'

[sahilshekhawat]

The results have been very unconsistence, sometimes it raises an error sometimes it does not.