The service log is attached.
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Ticket URL: <http://dev.deluge-torrent.org/ticket/3685>
Deluge <https://deluge-torrent.org/>
Deluge Project
* Attachment "deluge-web.log" added.
Service log
Upgrading Twisted to version 26.4.0 fixes the issue.
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Ticket URL: <http://dev.deluge-torrent.org/ticket/3685#comment:1>