[Plugin: The Events Calendar] is_event() true in archive post list?

The events calendar ver 1.6
I have now problem with my static navigation. if there is a event in the archive post list i get is_event() = 1; And that makes my static navigation go mad. The nav is done with if statement like
if (is_event() { echo id=\"navactive\""; }

I think is_event() = 1; should only be TRUE in calendar, list or single view when a event is displayed? Or have i done something wrong.