Uncaught TypeError: this.visualUndoManager.getData is not a function

Question

One of our external Developers can no longer edit his own created tickets in JIRA?

Environment

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36

Stack trace

TypeError: this.visualUndoManager.getData is not a function

I have no idea, what the reason is?

Herr Stange · Accepted Answer

Solved by refreshing the cache of the browser! Sometimes it is the simple things.