Error: undefined is not an object (evaluating ‘g.current.focus’)

hello,

btw awesome plugin, i recently installed it on another website of mine but it wont work. The widget appears on the screen but when I click on it, the chat appears for a split second but then disappears. Its strange because it works on all my other websites.

I get the following error code:

undefined is not an object (evaluating ‘g.current.focus’)

Thank you very much big fan of your work keep up the good work.