I get the error "Unable to get property 'createRange' of undefined or null reference" upon entering any text into a combobox using Internet Explorer 11.

I created a combobox, and without any code, client side or server side, entering any text into the Combobox gives me the following error.

Unable to get property 'createRange' of undefined or null reference

It only happens using Internet Explorer. With Chrome, I don't get an error, but events don't fire.

Any ideas?