I have used osm2po to create routing data after load the data to database(postgresql) then from it to QGis.when using the pgrouting plugin the error appears: 2019-05-16T12:43:17 WARNING Traceback (most recent call last): File "C:/Users/Alloylo/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\pgRoutingLayer\pgRoutingLayer.py", line 505, in setSourceIds vertexMarker.setCenter(geom.asPoint()) ValueError: Null geometry cannot be converted to a point.

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anyone had faced this before QGIS:3.6.2

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