Kodi switch to channel number four (not 4)

[seventhsite]

request failed
route:  /broker
query:  { phrase: 'switch to channel number four', q: 'four' }
error:  Error: channels not found
    at /home/node/app/helpers.js:520:23
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

But channel number 5 is ok.

==== BEGIN === route:  /broker
Broker processing phrase: 'switch to channel number 5' (en)
redirecting request to: 'kodiPlayChannelByNumber
PVR channel request received to play "5"

Same with some another digits.