[14:20:15 WARN]: [UltimateStacker] Task #4120 for UltimateStacker v2.2.1 generated an exception
java.lang.NullPointerException: Cannot invoke "String.toUpperCase(java.util.Locale)" because "this.content" is null
        at eu.decentsoftware.holograms.api.holograms.HologramLine.parseContent(HologramLine.java:193) ~[DecentHolograms-2.4.2.jar:?]
        at eu.decentsoftware.holograms.api.holograms.HologramLine.<init>(HologramLine.java:131) ~[DecentHolograms-2.4.2.jar:?]
        at eu.decentsoftware.holograms.api.DHAPI.createHologram(DHAPI.java:85) ~[DecentHolograms-2.4.2.jar:?]
        at eu.decentsoftware.holograms.api.DHAPI.createHologram(DHAPI.java:61) ~[DecentHolograms-2.4.2.jar:?]
        at com.songoda.ultimatestacker.core.hooks.holograms.DecentHologramsHolograms.createAt(DecentHologramsHolograms.java:95) ~[UltimateStacker-2.2.1.jar:?]
        at com.songoda.ultimatestacker.core.hooks.holograms.DecentHologramsHolograms.createHologram(DecentHologramsHolograms.java:38) ~[UltimateStacker-2.2.1.jar:?]
        at com.songoda.ultimatestacker.core.hooks.holograms.Holograms.createHologram(Holograms.java:48) ~[UltimateStacker-2.2.1.jar:?]
        at com.songoda.ultimatestacker.core.hooks.HologramManager.createHologram(HologramManager.java:52) ~[UltimateStacker-2.2.1.jar:?]
        at com.songoda.ultimatestacker.UltimateStacker.updateHologram(UltimateStacker.java:372) ~[UltimateStacker-2.2.1.jar:?]
        at com.songoda.ultimatestacker.UltimateStacker.lambda$onDataLoad$0(UltimateStacker.java:248) ~[UltimateStacker-2.2.1.jar:?]
        at com.songoda.ultimatestacker.database.DataManager.lambda$null$33(DataManager.java:328) ~[UltimateStacker-2.2.1.jar:?]
        at org.bukkit.craftbukkit.v1_18_R2.scheduler.CraftTask.run(CraftTask.java:101) ~[purpur-1.18.2.jar:git-Purpur-1632]
        at org.bukkit.craftbukkit.v1_18_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:483) ~[purpur-1.18.2.jar:git-Purpur-1632]
        at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1559) ~[purpur-1.18.2.jar:git-Purpur-1632]
        at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:522) ~[purpur-1.18.2.jar:git-Purpur-1632]
        at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1483) ~[purpur-1.18.2.jar:git-Purpur-1632]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1247) ~[purpur-1.18.2.jar:git-Purpur-1632]
        at net.minecraft.server.MinecraftServer.lambda$spin$1(MinecraftServer.java:321) ~[purpur-1.18.2.jar:git-Purpur-1632]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]