<Kotlin - Exposed DAO: Parameter specified as non-...

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Kotlin - Exposed DAO: Parameter specified as non-null is null [..] (parameter id)
I try to use Exposed to save data thats going to be shown in a TornadoFX Tableview. I have an entity class called Crossing and a table called Crossings. Now, to send it to TornadoFX I have a ItemViewModel of Crossing thats bound to the entity class values. The tableview uses the ItemViewModel and a list of data, in this case a list of Crossing objects. The list should be generated from a query.

The query is the following:

println("Element 1: ${Crossing.all().toList().get(0)}")


When I run...