Force diconnect from portal is returning an error, but disconnect is successful

Preconditions:

PMM server connected to the portal, user loged in as local admin.

STR.

1. Navigate to the Percona Platform page in pmm settings.
2. Click Disconnect button

Expected result:
Pmm successfully disconnected, without any error.

Actual Result:
Error message displayed, after refresh pmm server is disconnected.