2 geocode queries in a row produce debug warnings

There are 2 cases when user gets "QCoreApplication::postEvent: Unexpected null receiver" for 2 geocode queries in a row:
1. Warning is valid but unclear:
geocodeModel.query = query1
geocodeModel.update()
geocodeModel.query = query2
geocodeModel.update()
Here geocodeModel is bisy with first request so user gets warning, but it should describe the reason more neatly.

2. Unexpected warning.
First geocode is finished successfully and we start second geocode, but user still gets the warning. Please have a look at RouteDialog implementation at mapviewer.qml file, see attached screenshot as well.