Lines Disappearing after Save

[AO-StreetArt]

QGIS 2.18.9
PointConnector 1.0.1

PointConnector works correctly when it is first run. However, when the file is saved and re-opened, the lines created are not displayed. The PointConnector layers are still present, but lines are not displayed on the map.

[vladigg]

Hi, I have an issue applying PointConnector en Qgis3, I have a points layer with IDs in the first column of the attribute table. At the same time, I introduce a csv file with from to list. All the codes appear in the IDs column in the points layer. However, there are problem drawing the lines, they do not appear at all. The codes or IDs are number, it is a possibility that this is the problem?