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java.lang.NullPointerException: 	at net.minecraft.server.MinecraftServer.stopServer(MinecraftServer.java:494)	at net.minecraft.server.integrated.IntegratedServer.stopServer(IntegratedServer.java:377)	at net.minecraft.client.Minecraft.stopIntegratedServer(Minecraft.java:3075)	at net.minecraft.client.main.Main$2.run(Main.java:125)