js error on month view

I found a js error on month view: click on month view and then click at today button.
I added the test file in attached file.
testes.zip (53.4 KB)

Works just fine.
Maybe you forgot some additional steps?

Best regards,

There isn’t another step… just click in month view and then in today button or navigating with buttons next/last month: always when the actual month is showed the error appears :frowning: