git-gui cannot handle Non-ASCII character in gui.recentrepo

git gui works fine when there is no non-ASCII character in recentrepo entries.
Git gui can open the path with non-ASCII characters without any problem.
However if the gui.recentrepo contain non-ASCII characters, it will throw out an error.

The user.name can contain non-ASCII UTF8 characters .This works fine:

    git config --list
    user.name=NewUSer∞ π ∅
    <email address hidden>
    gui.recentrepo=/home/user/Documents/test.git

git gui can start without error.

However, if we put the non-ASCII characters into the gui.recentrepo:
    git config --global --add gui.recentrepo /home/user/Documents/∞_π_∅

    git config --list
    user.name=NewUSer∞ π ∅
    <email address hidden>
    gui.recentrepo=/home/user/Documents/test.git
    gui.recentrepo=/home/user/Documents/∞_π_∅

git gui will fail:

    > git gui
    Error in startup script: child process exited abnormally
        while executing
    "exec /usr/lib/git-core/git-config --global --unset gui.recentrepo {^/home/user/Documents/â_Ï_â$}"
        ("eval" body line 1)
        invoked from within
    "eval exec $opt $cmdp $args"
        (procedure "git" line 23)
        invoked from within
    "git config --global --unset gui.recentrepo "^$p\$""
        (procedure "_unset_recentrepo" line 3)
        invoked from within
    "_unset_recentrepo $p"
        (procedure "_get_recentrepos" line 7)
        invoked from within
    "_get_recentrepos"
        (procedure "choose_repository::pick" line 86)
        invoked from within
    "choose_repository::pick"
        invoked from within
    "if {[catch {
                    set _gitdir $env(GIT_DIR)
                    set _prefix {}
                    }]
            && [catch {
                    # beware that from the .git dir this sets _gitdir to .
                    # and _prefix t..."
        (file "/usr/lib/git-core/git-gui" line 1250)