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    java.lang.NullPointerException
        at msi.gama.metamodel.shape.GamaProxyGeometry.euclidianDistanceTo(GamaProxyGeometry.java:310)
        at msi.gama.metamodel.agent.AbstractAgent.euclidianDistanceTo(AbstractAgent.java:131)
        at msi.gama.metamodel.topology.continuous.ContinuousTopology.distanceBetween(ContinuousTopology.java:122)
        at msi.gaml.operators.Spatial$Relations.distance_to(Spatial.java:2901)
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