Its not possible to build Tindroid - For input string: ""

[SummerMMMM]

It's not possible to build Tindroid in Android Studio.

Error:

A problem occurred evaluating root project 'tindroid-master'.
> For input string: ""

Line 52 is:

return process.text.toInteger()

of

static def gitVersionCode() {
    def process = "git rev-list --count HEAD".execute()
    return process.text.toInteger()
}

[or-else]

Please build in a git directory.