Error creating events: index 0 has type 'NoneType' but 'QgsPointXY' is expected

[Deleted user]

When creating events (via the "Events" tab of the plugin) from certain datasets, processing will fail with an error message like the following:

2018-07-28T20:13:28     WARNING    Traceback (most recent call last):
              File "C:/.../QGIS/QGIS3\profiles\default/python/plugins\lrs\ui\lrsdockwidget.py", line 996, in createEvents
              events.create(layer, featuresSelect, routeFieldName, startFieldName, endFieldName, errorFieldName, outputName)
              File "C:/.../QGIS/QGIS3\profiles\default/python/plugins\lrs\lrs\lrsevents.py", line 105, in create
              geo = QgsGeometry.fromMultiPolylineXY(line)
             TypeError: index 0 has type 'NoneType' but 'QgsPointXY' is expected

This occurs when the dataset specifies a linear event of a directionality opposite to that of the route it references; that is, a linear event that has a "start" measure greater than its "end" measure. It seems this violates an assumption made by the plugin.

Directionality does matter in certain applications. For instance, when modeling the movement of a vehicle through a road network, it normally is important to know not just what portion of a road segment the vehicle traversed but in which direction it moved. Consequently, it would be useful for the plugin to support the creation of events of either directionality.

[blazek]

Fixed using Simon's pull request.