Fix spelling of "existent"
:: lookup the session id by duct
::
?~ maybe-channel-id=(~(get by duct-to-key.channel-state.state) duct)
- ~& [%canceling-nonexistant-channel duct]
+ ~& [%canceling-nonexistent-channel duct]
[~ state]
::
~& [%canceling-cancel duct]
