Refer this test survey i have created - https://www.anildagia.com/component/communitysurveys/survey/16-test-survey?catid=78&Itemid=5075&skey=SMath7698ZU9ycRW

It is a simple 1 single question of type multiline. Refer attached screenshot. I have just entered the text ABCDE in the description.

This survey gives an error. Refer screenshots. The browser console message says Call to undefined method Joomla\CMS\Document\JsonDocument::addCustomTag()

As soo as I remove the text from the description field, the survey works fine.