Git reports "error: Server does not allow request for unadvertised object"

I have a git checkout of http://git.blender.org/blender.git that I regularly update with make update. Recently, I’ve seen multiple times that the update process fails with the following error:

paulm@cmstorm 09:18:/data/c/blender-git$ make update
python3 ./build_files/utils/make_update.py

Updating Precompiled Libraries and Tests


Updating Blender Git Repository

git pull --rebase
remote: Enumerating objects: 5937, done.
remote: Counting objects: 100% (3751/3751), done.
...
From http://git.blender.org/blender-addons-contrib
   786f470..c4e727c  master     -> origin/master
Fetching submodule source/tools
error: Server does not allow request for unadvertised object 24a26488775dbe8cf2c1273d60a74c9d570d773c
make: *** [GNUmakefile:543: update] Error 1

A subsequent make update succeeds in all cases. Is using make update still the right way to update? Is this a server-side issue only?