The message we enter when we create a stash is the description, not a ref format branch name. When trying to create a stash with a description containing a space I get an error:

"The stash desc is invalid. Ref names must follow git ref-format rules:
https://www.kernel.org/pub/software/scm/git/docs/git-check-ref-format.html
Completed with errors, see above."

but git command git stash save "Server no log" works perfectly.