I encountered this just today.  It happens in the latest V3 API when
you try to create a marker with a an undefined latitude or longitude.
On Firefox, it crashed my script altogether. My fix was:

function createMarker(m) {
        if (m.LATDD != undefined && m.LONGDD != undefined) {  // if stmnt
added to avoid odd IE bug
                var marker = new google.maps.Marker({
                        position: new google.maps.LatLng(m.LATDD,m.LONGDD),
                        map: map,
                        title:m.MAP_LABEL
                });
        }
}

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