non-scalar nodes exceeds the specified max=50

Hello, I've recently got an error report from a user with this message.

Error (open) Error (close)

Code:

org.bukkit.configuration.InvalidConfigurationException: org.yaml.snakeyaml.error.YAMLException: Number of aliases for non-scalar nodes exceeds the specified max=50
at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlConfiguration.java:56) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:160) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:128) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at org.bukkit.configuration.file.YamlConfiguration.loadConfiguration(YamlConfiguration.java:183) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at me.darkolythe.itemcreatorplus.CustomItems.ItemList.setUp(ItemList.java:120) ~[?:?]
at me.darkolythe.itemcreatorplus.ItemCreatorPlus.onEnable(ItemCreatorPlus.java:34) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:351) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:480) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at org.bukkit.craftbukkit.v1_16_R1.CraftServer.enablePlugin(CraftServer.java:488) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at org.bukkit.craftbukkit.v1_16_R1.CraftServer.enablePlugins(CraftServer.java:402) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at net.minecraft.server.v1_16_R1.MinecraftServer.loadWorld(MinecraftServer.java:436) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at net.minecraf
t.server.v1_16_R1.DedicatedServer.init(DedicatedServer.java:219) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at net.minecraft.server.v1_16_R1.MinecraftServer.v(MinecraftServer.java:808) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at net.minecraft.server.v1_16_R1.MinecraftServer.lambda$0(MinecraftServer.java:164) ~[gbinvl_spigot-1.16.1.jar:git-Spigot-758abbe-2b00831]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]

I cannot seem to figure out what is causing it as it occurs for them, but I cannot seem to replicate it.

It's clearly being caused by some YML error, and it wipes out the yml file entirely when it happens

 

@thechrisanator Could you ask them for the file?

 

https://pastebin.com/1CNXyF6H

 

@thechrisanator I'm not really sure what the cause is. You said you don't get the same result when you use the same file?