Extended choice parameter plugin + Scripted Pipeline (Parallel) issue

[xwyxw]

I am having a rough time findout what is going on with weird behavior,  when I use  Scripted Pipeline (Parallel) and Extended choice parameter  plugin. Everything seams okay as long as I do not select Yes on "Save Artifacts Externally?" option. If that happen I endup getting nonsense errors like.

ERROR: Workspace has a .git repository, but it appears to be corrupt.
[W] hudson.plugins.git.GitException: Error performing command: C:\Program Files\Git\cmd\git.exe rev-parse --is-inside-work-tree

JSON Parameter Config Groovy Script

import org.boon.Boon;

def jsonEditorOptions = Boon.fromJson(/{

disable_edit_json: true,

        disable_properties: true,

        no_additional_properties: true,

        disable_collapse: true,

        disable_array_add: true,

        disable_array_delete: true,

        disable_array_reorder: true,

        show_errors: "always"

        theme: "bootstrap3",

        iconlib:"fontawesome4",

        schema: {

                 "title": "Save Artifacts Externally?",

                 "oneOf": [

                 {

                     "title": "No",

                     "type": "null",

                     "options": {

                         "disable_collapse": true,

                         "disable_edit_json": true,

                         "disable_properties": true,

                          "theme": "bootstrap3",

                          "show_errors": "always"

                       }

                  },

                  {

                      "title": "Yes",

                      "type": "object",

                      "properties": {

                          "copypathType": {

                               "title": "Path",

                               "type": "string"

                           }

                       }

                  }]

         }

}/);

Pipeline Script

#!groovy

try {

    CheckoutRepos()

} catch(e) {

    NotifyFail()

    throw e

}

def CheckoutRepos() {

    stage('Checkout') {

        parallel 'W': {

            node {

                checkout changelog: false, poll: false, scm: [$class: 'GitSCM', branches: [[name: "${env.GIT_W_BRANCH}"]], browser: [$class: 'GitLab', repoUrl: 'http://gitlab.local/', version: '8.13'], doGenerateSubmoduleConfigurations: false, extensions: [[$class: 'CloneOption', depth: 0, noTags: true, reference: '', shallow: true]], extensions: [[$class: 'CleanBeforeCheckout']], submoduleCfg: [], userRemoteConfigs: [[credentialsId: '1c228aa2-4af0-4026-b376-7244e2336083', url: 'g...@gitlab.local:f/W.git']]]

            }

        }, 's': {

            node {

                checkout changelog: false, poll: false, scm: [$class: 'GitSCM', branches: [[name: "${env.GIT_S_BRANCH}"]], browser: [$class: 'GitLab', repoUrl: 'http://gitlab.local/', version: '8.13'], doGenerateSubmoduleConfigurations: false, extensions: [[$class: 'CloneOption', depth: 0, noTags: true, reference: '', shallow: true]], extensions: [[$class: 'CleanBeforeCheckout']], submoduleCfg: [], userRemoteConfigs: [[credentialsId: '1c228aa2-4af0-4026-b376-7244e2336083', url: 'g...@gitlab.local:f/s.git']]]

            }

        }, 'C': {

            node {

                checkout changelog: false, poll: false, scm: [$class: 'GitSCM', branches: [[name: "${env.GIT_C}"]], browser: [$class: 'GitLab', repoUrl: 'http://gitlab.local/', version: '8.13'], doGenerateSubmoduleConfigurations: false, extensions: [[$class: 'CloneOption', depth: 0, noTags: true, reference: '', shallow: true]], extensions: [[$class: 'CleanBeforeCheckout']], submoduleCfg: [], userRemoteConfigs: [[credentialsId: '1c228aa2-4af0-4026-b376-7244e2336083', url: 'g...@gitlab.local:f/c.git']]]

            }

        }

    }

}