IE11 - Paragraph field show 'This field is required' even though add a body text and form can not save

• Type: Bug
• Status: Verified
• Resolution: Unresolved
• Affects Version/s: 7.1.X
• Fix Version/s: None
• Component/s: CKEditor, Forms
• Labels: None
• Fix Priority: 4
• QA Test Name:
  • Manual_Environment_Forms
• QA Test Score: 5

Steps to reproduce:

1. Go to Content -> Forms -> Add a new Form
2. Add a Paragraph field
   • Enter a Title
   • Type something in the Body Text (BUG: browser console log error)
3. Save form

Expected Result:
Can add the body text and can save form.

Actual Result:
Can not save, Paragraph field shows 'This field is required' even though a body text has been added.

The following error appears in the console log while entering a body text (LiferayAlloyEditor component):

Cannot read property ‘getRanges’ of undefined 
ckeditor.js (379,393)