Problem with git cloning


during the last months i have no problems with cloning the openwrt git to build my firmware
i use VirtuaBox with Debian 10 guest (windows 10 host)

Since a couple of days i have this message when i try to clone it

nonosch@debOpenWrt:~$ umask 0022
nonosch@debOpenWrt:~$ git clone
Clonage dans 'openwrt'...
remote: Enumerating objects: 518068, done.
remote: Counting objects: 100% (518068/518068), done.
remote: Compressing objects: 100% (139022/139022), done.
error: inflate: data stream error (incorrect data check)
fatal: le paquet a un mauvais objet à l'offset 189504 : la décompression (inflate) a retourné -3
fatal: échec de index-pack

has anyome an idea of what could be the problem ?