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java.lang.NullPointerException at msi.gaml.statements.SetStatement$AssignmentSerializer.serialize(SetStatement.java:64) at msi.gaml.statements.LetStatement$LetSerializer.serialize(LetStatement.java:84) at msi.gaml.descriptions.SymbolSerializer.serialize(SymbolSerializer.java:278) at msi.gaml.descriptions.SymbolDescription.serialize(SymbolDescription.java:199) at msi.gaml.descriptions.SymbolSerializer.serializeChild(SymbolSerializer.java:318) at msi.gaml.statements.IfStatement$IfSerializer.access$0(IfStatement.java:1) at msi.gaml.statements.IfStatement$IfSerializer$1.visit(IfStatement.java:89) at msi.gaml.descriptions.StatementWithChildrenDescription.visitChildren(StatementWithChildrenDescription.java:46) at msi.gaml.statements.IfStatement$IfSerializer.serializeChildren(IfStatement.java:82) at msi.gaml.descriptions.SymbolSerializer.serialize(SymbolSerializer.java:286) at msi.gaml.descriptions.SymbolSerializer.serialize(SymbolSerializer.java:278) at msi.gaml.descriptions.SymbolDescription.serialize(SymbolDescription.java:199) at msi.gaml.compilation.Symbol.serialize(Symbol.java:69) at msi.gama.runtime.exceptions.GamaRuntimeException.addContext(GamaRuntimeException.java:166) at msi.gaml.statements.AbstractStatement.executeOn(AbstractStatement.java:43) at msi.gaml.statements.AbstractStatementSequence.executeOn(AbstractStatementSequence.java:43) at msi.gaml.statements.AbstractStatementSequence.privateExecuteIn(AbstractStatementSequence.java:57) at msi.gaml.statements.AbstractStatement.executeOn(AbstractStatement.java:41) at msi.gaml.statements.AbstractStatementSequence.executeOn(AbstractStatementSequence.java:43) at msi.gaml.statements.IfStatement.privateExecuteIn(IfStatement.java:136) at msi.gaml.statements.AbstractStatement.executeOn(AbstractStatement.java:41) at msi.gaml.statements.AbstractStatementSequence.executeOn(AbstractStatementSequence.java:43) at msi.gaml.statements.AbstractStatementSequence.privateExecuteIn(AbstractStatementSequence.java:57) at msi.gaml.architecture.reflex.ReflexStatement.privateExecuteIn(ReflexStatement.java:80) at msi.gaml.statements.AbstractStatement.executeOn(AbstractStatement.java:41) at msi.gaml.statements.AbstractStatementSequence.executeOn(AbstractStatementSequence.java:43) at msi.gaml.architecture.reflex.ReflexArchitecture.executeReflexes(ReflexArchitecture.java:100) at msi.gaml.architecture.reflex.ReflexArchitecture.executeOn(ReflexArchitecture.java:91) at msi.gama.runtime.ExecutionScope.execute(ExecutionScope.java:380) at msi.gama.metamodel.agent.AbstractAgent.doStep(AbstractAgent.java:278) at msi.gama.metamodel.agent.MinimalAgent.doStep(MinimalAgent.java:225) at msi.gama.metamodel.agent.AbstractAgent.step(AbstractAgent.java:249) at msi.gama.runtime.ExecutionScope.lambda$1(ExecutionScope.java:426) at msi.gama.runtime.ExecutionScope.runAndCatch(ExecutionScope.java:459) at msi.gama.runtime.ExecutionScope.pushRunAndCatch(ExecutionScope.java:450) at msi.gama.runtime.ExecutionScope.step(ExecutionScope.java:426) at msi.gama.runtime.concurrent.GamaExecutorService.doStep(GamaExecutorService.java:179) at msi.gama.runtime.concurrent.GamaExecutorService.step(GamaExecutorService.java:154) at msi.gama.metamodel.population.GamaPopulation.stepAgents(GamaPopulation.java:176) at msi.gama.metamodel.population.GamaPopulation.step(GamaPopulation.java:171) at msi.gama.runtime.ExecutionScope.lambda$2(ExecutionScope.java:427) at msi.gama.runtime.ExecutionScope.runAndCatch(ExecutionScope.java:459) at msi.gama.runtime.ExecutionScope.step(ExecutionScope.java:427) at msi.gama.metamodel.agent.GamlAgent.stepSubPopulations(GamlAgent.java:94) at msi.gama.metamodel.agent.AbstractAgent.doStep(AbstractAgent.java:278) at msi.gama.metamodel.agent.MinimalAgent.doStep(MinimalAgent.java:225) at msi.gama.metamodel.agent.AbstractAgent.step(AbstractAgent.java:249) at msi.gama.runtime.concurrent.SimulationRunner.lambda$0(SimulationRunner.java:30) at msi.gama.runtime.concurrent.SimulationRunner.lambda$1(SimulationRunner.java:54) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)