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ERROR: Cannot invoke "javafx.scene.Node.getScene()" because "n" is null

This happens when a UI component is not properly initialized or added to the scene graph before layout operations occur. [JavaFX Application Thread] ERROR haveno ...
GitHub

[Bug]: java.lang.NullPointerException: Cannot invoke "java.util.Map.keySet()"

Caused by: java.lang.NullPointerException: Cannot invoke "java.util.Map.keySet()" because the return value of "io.swagger.v3.oas.models.media.Discriminator.getMapping ...