'NoneType' object ... error in adding a tag to a monitor

[sadjad-chrono]

I'm getting this error randomly when trying to add a tag to a monitor:

[7] [CRITICAL] 'NoneType' object does not support item assignment

but the tag is being successfully attached to the monitor.

[benhaleWV]

We are seeing the same issue, using medaziz11/uptimekuma_restapi. This is the error on the corresponding Invoke-WebRequest call.
Invoke-WebRequest: { "detail": "\u0027NoneType\u0027 object does not support item assignment" }