[Qgis-developer] wrapped C/C++ object of type QgsMapRenderer has been deleted

[Radim Blazek]

I have got strange bug report for python plugin, when calling from initGui()
   iface.mapCanvas().mapRenderer().hasCrsTransformEnabled()
it gives
   RuntimeError: wrapped C/C++ object of type QgsMapRenderer has been deleted

>From C++ code I see that QgisApp mMapCanvas is created in QgisApp
constructor and never deleted and QgsMapCanvas mMapRenderer is created
in QgsMapCanvas constructor and deleted in QgsMapCanvas destructor. I
don't see how it can happen that QgsMapRenderer is deleted.

Any clue?

Radim