[Python] Meu bot do telegram não mostra o meu gráfico e quebra o código

Meu codigo ta dando erro, eu não consigo mostrar o gráfico em um bot de telegram, que ele quebra o código

import matplotlib.pyplot as plt

def gerar_grafico(despesas):
if not despesas:
return None
categorias = {}
for d in despesas:
categorias[d['categoria']] = categorias.get(d['categoria'], 0) + d['valor']

labels = list(categorias.keys())
valores = list(categorias.values())

plt.figure(figsize=(6,6))
plt.pie(valores, labels=labels, autopct='%1.1f%%')
plt.title('Distribuição das Despesas por Categoria')
caminho_arquivo = 'grafico_despesas.png'
plt.savefig(caminho_arquivo)
plt.close()
return caminho_arquivo



este é o código que eu fiz, com matplotlib

2025-08-30 12:13:56,103 (__init__.py:1115 MainThread) ERROR - TeleBot: "Infinity polling exception: unsupported operand type(s) for +: 'int' and 'str'"
2025-08-30 12:13:56,108 (__init__.py:1117 MainThread) ERROR - TeleBot: "Exception traceback:
Traceback (most recent call last):
File "C:\Users\Paulo\Downloads\bot\.venv\Lib\site-packages\telebot\__init__.py", line 1110, in infinity_polling
self.polling(non_stop=True, timeout=timeout, long_polling_timeout=long_polling_timeout,
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
logger_level=logger_level, allowed_updates=allowed_updates, restart_on_change=False,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
*args, **kwargs)
^^^^^^^^^^^^^^^^
File "C:\Users\Paulo\Downloads\bot\.venv\Lib\site-packages\telebot\__init__.py", line 1198, in polling
self.__threaded_polling(non_stop=non_stop, interval=interval, timeout=timeout, long_polling_timeout=long_polling_timeout,
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
logger_level=logger_level, allowed_updates=allowed_updates)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Paulo\Downloads\bot\.venv\Lib\site-packages\telebot\__init__.py", line 1273, in __threaded_polling
raise e
File "C:\Users\Paulo\Downloads\bot\.venv\Lib\site-packages\telebot\__init__.py", line 1235, in __threaded_polling
self.worker_pool.raise_exceptions()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "C:\Users\Paulo\Downloads\bot\.venv\Lib\site-packages\telebot\util.py", line 154, in raise_exceptions
raise self.exception_info
File "C:\Users\Paulo\Downloads\bot\.venv\Lib\site-packages\telebot\util.py", line 97, in run
task(*args, **kwargs)
~~~~^^^^^^^^^^^^^^^^^
File "C:\Users\Paulo\Downloads\bot\.venv\Lib\site-packages\telebot\__init__.py", line 10134, in _run_middlewares_and_handler
result = handler['function'](message)
File "c:\Users\Paulo\Downloads\bot\comandos.py", line 88, in enviar_grafico
caminho_arquivo = gerar_grafico(despesas_dict)
File "c:\Users\Paulo\Downloads\bot\grafico.py", line 8, in gerar_grafico
categorias[d['categoria']] = categorias.get(d['categoria'], 0) + d['valor']
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
TypeError: unsupported operand type(s) for +: 'int' and 'str'
"


deu este erro, esperava que aparecesse o gráfico la no chat do meu bot do telegram

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