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Docker save failes with "Error response from daemon: file integrity checksum failed"

Hello all,

 I'm trying to backup a docker image I created from a running container. I changed the docker-compose.xml. Every time I do a 'docker save appname -o appname_backup.tar' it fails with "Error response from daemon: file integrity checksum failed for "home/wekan/app/docker-compose.yml". I want the modified docker-compose file. How do I bypass that check, or update the checksum?

docker ps:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
5240dbddf13d quay.io/wekan/wekan “node /build/main.js” 3 days ago Up 2 hours 0.0.0.0:80->8080/tcp wekan-app
5508b9f7bd5b mongo:3.2.21 “docker-entrypoint.s…” 3 days ago Up 2 hours 27017/tcp wekan-db

docker images:
REPOSITORY TAG IMAGE ID CREATED SIZE
wekan_app_backup latest 46138b688a23 37 minutes ago 626MB #backup
wekan_mongo_db latest 96439aaa4446 3 hours ago 300MB #backup
mquandalle/wekan latest b181063e17e5 8 days ago 626MB
quay.io/wekan/wekan latest fa4fe1f2d869 8 days ago 626MB

 Thank you