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java.lang.NullPointerException: 	at net.bhl.cdt.paxelerate.model.command.helper.GeneratePassenger.performGeneratePassengers(GeneratePassenger.java:164)	at net.bhl.cdt.paxelerate.ui.commands.GeneratePassengersCommand$1.run(GeneratePassengersCommand.java:110)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)