Failed initializing git-flow if change [develop] branch name

Description

I tried to initializing git-flow many times, at last, I have to initialize git-flow use another tool.

The bug is that if there wasn't a local branch named "develop", I will get an error and could not initialize git-flow. 

I think the best behavior is that if I don't have a [develop] branch, git-flow will automatically create it and I can use other names for the [develop] branch, like "dev".

I like SourceTree, hope it will fix soon.

Error message

git init -d 
Using default branch names.
Fatal: Local branch 'develop' does not exist.

Which branch should be used for integration of the "next release"?
   - dev
Branch name for "next release" development: [develop] 
Completed with errors, see above

Version

SourceTree Version: 4.0.1(234)

use embedded git (2.23.0) and embedded git-flow