Minecraft 1.15.2
CS-CoreLib vv1.6.1
Slimefun v4.2-git-191217
Server is running CraftBukkit version git-Spigot-a03b1fd-bbe3d58 (MC: 1.15.2) (Implementing API version 1.15.2-R0.1-SNAPSHOT)

[Server thread/ERROR]: [Slimefun] An Error occured while updating a Capacitor Texture for Slimefun 4.2-git-191217
java.lang.NullPointerException: null
at me.mrCookieSlime.CSCoreLibPlugin.general.World.CustomSkull.getTexture
(CustomSkull.java:174) ~[?:?]
at me.mrCookieSlime.CSCoreLibPlugin.general.World.CustomSkull.setSkull(C
ustomSkull.java:73) ~[?:?]
at me.mrCookieSlime.Slimefun.api.energy.ChargableBlock.lambda$updateText
ure$0(ChargableBlock.java:109) ~[?:?]
at org.bukkit.craftbukkit.v1_15_R1.scheduler.CraftTask.run(CraftTask.jav
a:81) [spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
at org.bukkit.craftbukkit.v1_15_R1.scheduler.CraftScheduler.mainThreadHe
artbeat(CraftScheduler.java:394) [spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
at net.minecraft.server.v1_15_R1.MinecraftServer.b(MinecraftServer.java:
1036) [spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
at net.minecraft.server.v1_15_R1.DedicatedServer.b(DedicatedServer.java:
406) [spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
at net.minecraft.server.v1_15_R1.MinecraftServer.a(MinecraftServer.java:
984) [spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.jav
a:824) [spigot-1.15.2.jar:git-Spigot-a03b1fd-bbe3d58]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_251]

I use GEO Miner and add it to force load chunks, then error.
And I use a "Authlib", it modify mojang auth server url to "Authlib" url, cause credits skull image is unknown image.
How I to fixed this error?

My bad english.

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This error is fixed.