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When trying to change the currency in the trial balance I am getting this error:


    if (account_sum.get('debit', 0.0) - account_init_bal.get('debit', 0.0)) or (account_sum.get('credit', 0.0) - account_init_bal.get('credit', 0.0)) or\
TypeError: unsupported operand type(s) for -: 'NoneType' and 'NoneType'


Any suggestions how to solve it?


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