8000 Error With Adding Handler · Issue #4803 · python-telegram-bot/python-telegram-bot · GitHub
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Error With Adding Handler #4803

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kadir5131 opened this issue May 25, 2025 · 2 comments · Fixed by #4802
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Error With Adding Handler #4803

kadir5131 opened this issue May 25, 2025 · 2 comments · Fixed by #4802
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🔌 bug pr description: bug

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@kadir5131
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What kind of feature are you missing? Where do you notice a shortcoming of PTB?

\Python312\Lib\site-packages\telegram\ext_application.py", line 1259, in process_update
for handlers in self.handlers.values():
^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: dictionary changed size during iteration

I want the buttons in that menu to be active when navigating between menus in Telegram, but sometimes ı encounter this problem when I try to add or delete handlers for the buttons.

Describe the solution you'd like

We need to be able to add or remove handlers while the code is running, this is a big deficiency.

Describe alternatives you've considered

No response

Additional context

No response
@kadir5131 kadir5131 added the 📋 triage work status: triage label May 25, 2025
@aelkheir
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Hey, thanks for the report. A fix is on the way #4802

@aelkheir aelkheir added 🔌 bug pr description: bug and removed 📋 triage work status: triage labels May 26, 2025
@aelkheir aelkheir mentioned this issue May 26, 2025
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@Bibo-Joshi
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for completeness let me add that, depending on your use case, ConversationHandler will be a cleaner solution that using add/remove_handler at runtime.

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@Bibo-Joshi @aelkheir @kadir5131
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