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Can not upload image inside code block

See original GitHub issue

Describe the bug When I try to upload an image inside Code Block. I received an error is:

Uncaught (in promise) TypeError: Cannot read property 'find' of undefined
    at mediaLibrary.js:299
    at index.js:8
    at redux.js:475
    at MediaLibrary.js:151
    at Object.Gg (react-dom.production.min.js:155)
    at Fg (react-dom.production.min.js:13)
    at Ig (react-dom.production.min.js:13)
    at be (react-dom.production.min.js:15)
    at Jg (react-dom.production.min.js:156)
    at Ic (react-dom.production.min.js:15)

To Reproduce

Go to localhost:8000/admin
Click on New Blog
Click on new Image inside Code Block
Try to upload an image
See error at console

Expected behavior I want to can upload an image without any error

Screenshots

Applicable Versions:

Netlify CMS app version: [2.10.1]
Git provider: [GitHub]
OS: [Windows 10]
Browser version: [79.0.3945.88]
Node.JS version: [v10.16.0]

CMS configuration

backend:
  name: git-gateway
  branch: master

media_folder: static/img
public_folder: /img
publish_mode: editorial_workflow

collections:
  - name: "blog"
    label: "Blog"
    folder: "src/blog-posts"
    create: true
    slug: "{{year}}-{{month}}-{{day}}-{{slug}}"
    editor:
     preview: true
    fields:
      - { label: "Title", name: "title", widget: "string" }
      - {
          label: 'Publish Date',
          name: 'date',
          widget: 'datetime',
          dateFormat: 'YYYY-MM-DD',
          timeFormat: 'HH:mm',
          format: 'YYYY-MM-DD HH:mm',
        }
      - { label: "Description", required: false, name: "description", widget: "string" }
      - { label: 'Body', name: 'body', widget: 'markdown', hint: 'Main content goes here.' }
      - { 
          label: "Tags", 
          name: "tags", 
          widget: "select", 
          options: ['ReactJs', 'JavaScript', 'Redux', 'NodeJs'],
          multiple: true 
        }

My repo: https://github.com/thaind97git/tech-blog