"git submodule update" does not work.

[Elshid]

I am Running on Debian Buster. During Install, the command "git submodule update" does not work, it returns the following errors / output:
error: Server does not allow request for unadvertised object 1db32ab
Fetched in submodule path 'dff/unsupported', but it did not contain 1db32ab. Direct fetching of that commit failed.