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java.lang.NullPointerException: 	at me.gnat008.perworldinventory.data.serializers.EconomySerializer.serialize(EconomySerializer.java:33)	at me.gnat008.perworldinventory.data.serializers.PlayerSerializer.serialize(PlayerSerializer.java:69)	at me.gnat008.perworldinventory.data.FileWriter.saveToDatabase(FileWriter.java:103)	at me.gnat008.perworldinventory.data.FileWriter.lambda$saveToDatabase$0(FileWriter.java:81)	at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftTask.run(CraftTask.java:71)	at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)