Un-reproducible bug -- invalid state file at `./.beat/config.json'

I randomly get this warning:

WARNING: invalid state file at `./.beat/config.json' - removing and re-starting...

Warning is displayed (and the configuration is reset) randomly after one of these commands:

$ ./bin/beat config set platform "http://127.0.0.1:8000/"
$ ./bin/beat config set user "user" token "3"
$ ./bin/beat config set cache "/idiap/temp/teglitis/BEAT-cache/"
$ ./bin/beat config color dark
$ ./bin/beat config list
$ ./bin/beat experiments push teodors/teodors/vein_recognition_only_dev/1/putvein-muira-only-dev-100

It seams that warnings aren't raised if the config is modified using single command:

$ ./bin/beat config set user "user" token "3" platform "http://127.0.0.1:8000/" cache "/idiap/temp/teglitis/BEAT-cache/"

But still this seams to me as a bug.

Teo