|  | @@ -99,7 +99,10 @@ class TelegramBot(object):
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				|  |  |          data = aiohttp.FormData()
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				|  |  |          for key, value in parameters.items():
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				|  |  |              if not (key in exclude or value is None):
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				|  |  | -                if type(value) in (int, dict, list,):
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				|  |  | +                if (
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				|  |  | +                    type(value) in (int, list,)
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				|  |  | +                    or (type(value) is dict and 'file' not in value)
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				|  |  | +                ):
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				|  |  |                      value = json.dumps(value, separators=(',', ':'))
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				|  |  |                  data.add_field(key, value)
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				|  |  |          return data
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				|  | @@ -206,7 +209,9 @@ class TelegramBot(object):
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				|  |  |              certificate = self.certificate
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				|  |  |          if type(certificate) is str:
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				|  |  |              try:
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				|  |  | -                certificate = open(certificate, 'r')
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				|  |  | +                certificate = dict(
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				|  |  | +                    file=open(certificate, 'r')
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				|  |  | +                )
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				|  |  |              except FileNotFoundError as e:
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				|  |  |                  logging.error(f"{e}\nCertificate set to `None`")
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				|  |  |                  certificate = None
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				|  | @@ -214,8 +219,8 @@ class TelegramBot(object):
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				|  |  |              'setWebhook',
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				|  |  |              parameters=locals()
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				|  |  |          )
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				|  |  | -        if certificate is not None:  # Close certificate file, if it was open
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				|  |  | -            certificate.close()
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				|  |  | +        if type(certificate) is dict:  # Close certificate file, if it was open
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				|  |  | +            certificate['file'].close()
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				|  |  |          return result
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				|  |  |  
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				|  |  |      async def deleteWebhook(self):
 |