is_object($_SESSION['dagobertduck']);

hi: i wonder why... if(!is_object($_SESSION['xmlModel'])) echo "there is no obj present, juppa**"; at my place always results in TRUE or echoing the "there is no.. ", even if var_dump reports that $_SESSION['xmlModel'] is an object. did i screw something up or are there special policies with the beloved session variables? i thought $_SESSION is just mapped into memory from the session-container during init on every request and at the end of the script serialized back to the container? maybe i missed special policies for referencing objects stored in the session-variable? thanks! /m