[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]: java.lang.IllegalArgumentException: Configuration does not accept objects of type class java.util.Optional
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at ninja.leaping.configurate.ScalarConfigValue.setValue(ScalarConfigValue.java:42)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at ninja.leaping.configurate.SimpleConfigurationNode.insertNewValue(SimpleConfigurationNode.java:274)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at ninja.leaping.configurate.SimpleConfigurationNode.setValue(SimpleConfigurationNode.java:201)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at ninja.leaping.configurate.commented.SimpleCommentedConfigurationNode.setValue(SimpleCommentedConfigurationNode.java:74)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at ninja.leaping.configurate.commented.SimpleCommentedConfigurationNode.setValue(SimpleCommentedConfigurationNode.java:32)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at ninja.leaping.configurate.SimpleConfigurationNode.setValue(SimpleConfigurationNode.java:182)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at ninja.leaping.configurate.commented.SimpleCommentedConfigurationNode.setValue(SimpleCommentedConfigurationNode.java:74)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at ninja.leaping.configurate.commented.SimpleCommentedConfigurationNode.setValue(SimpleCommentedConfigurationNode.java:32)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at org.spongepowered.common.config.DataSerializableTypeSerializer.serialize(DataSerializableTypeSerializer.java:59)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at org.spongepowered.common.config.DataSerializableTypeSerializer.serialize(DataSerializableTypeSerializer.java:41)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at ninja.leaping.configurate.ConfigurationNode.setValue(ConfigurationNode.java:402)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at com.gmail.trentech.pji.data.PlayerInventoryData.serialize(PlayerInventoryData.java:431)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at com.gmail.trentech.pji.sql.PlayerDB$Data.update(PlayerDB.java:261)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at com.gmail.trentech.pji.settings.PlayerSettings.save(PlayerSettings.java:96)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at com.gmail.trentech.pji.EventManager.onSaveWorldEvent(EventManager.java:272)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at org.spongepowered.common.event.listener.SaveWorldEventListener_EventManager_onSaveWorldEvent54.handle(Unknown Source)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:313)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:297)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:338)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:326)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at net.minecraft.world.WorldServer.handler$onSaveAllChunks$zkb000(WorldServer.java:2325)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at net.minecraft.world.WorldServer.func_73044_a(WorldServer.java:1016)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at org.spongepowered.common.world.WorldManager.saveWorld(WorldManager.java:520)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at net.minecraft.server.MinecraftServer.func_71267_a(MinecraftServer.java:3870)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at net.minecraft.server.MinecraftServer.constant$getSaveTickInterval$zho000(MinecraftServer.java:3825)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:632)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
[12:31:55] [Server thread/INFO] [STDERR]: [com.gmail.trentech.pji.data.PlayerInventoryData:serialize:435]:      at java.lang.Thread.run(Unknown Source)