I am trying to import a shapefile (multipolygon) in an app with ogr but I got an error about invalid geom type. If I inspect the data with ogr like this:

datasource = ogr.Open("c:\\temp\\data.shp")
layer = datasource.GetLayer(0)
print(layer.GetGeomType())

The print returns: >> -2147483645

I wonder what Geom Type is this. Is it an error in the data or is it a real Geom Type?