Looks like a bug with prototype 1.6; why?

I have a really short page, basically it's XHTML 1.0
transitional,
with a title and a script link to prototype. I don't have
anything in
the body. I get this for line 3936 in the error console
(firefox 2.0)

Error: element.dispatchEvent is not a function
Source File: file:///h:/programs/web/prototype.js
Line: 3936

It's referring to the if branch around this area:

      if (document.createEvent) {
        element.dispatchEvent(event);
      } else {
        element.fireEvent(event.eventType, event);
      }

Can someone explain why this is happening?
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