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java.lang.NullPointerException: 	at magic.model.event.MagicSourceManaActivation.canProduce(MagicSourceManaActivation.java:51)	at magic.model.choice.MagicPayManaCostResultBuilder.build(MagicPayManaCostResultBuilder.java:62)	at magic.model.choice.MagicPayManaCostResultBuilder.build(MagicPayManaCostResultBuilder.java:127)	at magic.model.choice.MagicPayManaCostResultBuilder.build(MagicPayManaCostResultBuilder.java:127)	at magic.model.choice.MagicPayManaCostResultBuilder.hasResults(MagicPayManaCostResultBuilder.java:157)	at magic.model.condition.MagicManaCostCondition.accept(MagicManaCostCondition.java:28)	at magic.model.event.MagicPayManaCostEvent.isSatisfied(MagicPayManaCostEvent.java:47)	at magic.model.event.MagicActivation.canPlay(MagicActivation.java:108)	at magic.model.event.MagicSourceActivation.canPlay(MagicSourceActivation.java:26)	at magic.model.choice.MagicPlayChoice.addValidChoices(MagicPlayChoice.java:78)	at magic.model.choice.MagicPlayChoice.getArtificialOptions(MagicPlayChoice.java:68)	at magic.model.choice.MagicChoice.getArtificialChoiceResults(MagicChoice.java:86)	at magic.model.choice.MagicChoice.getSimulationChoiceResult(MagicChoice.java:103)	at magic.model.event.MagicEvent.getSimulationChoiceResult(MagicEvent.java:443)	at magic.ai.MCTSAI.runSimulation(MCTSAI.java:483)	at magic.ai.MCTSAI.randomPlay(MCTSAI.java:446)	at magic.ai.MCTSAI.access$000(MCTSAI.java:65)	at magic.ai.MCTSAI$2.run(MCTSAI.java:188)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)