[19:55:54 WARN]: [HolographicDisplays] The placeholder {baltop10-userbalance} registered by the plugin HolographicDisplaysExtension generated an exception while updating. Please contact the author of HolographicDisplaysExtension
java.util.ConcurrentModificationException
        at java.util.HashMap$EntrySpliterator.tryAdvance(HashMap.java:1722) ~[?:1.8.0_222]
        at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126) ~[?:1.8.0_222]
        at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:499) ~[?:1.8.0_222]
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:486) ~[?:1.8.0_222]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[?:1.8.0_222]
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[?:1.8.0_222]
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_222]
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566) ~[?:1.8.0_222]
        at me.neutralplasma.holodisplayextension.checks.BalanceChecks.getBalancesUsers(BalanceChecks.java:93) ~[HolographicDisplaysExtension.jar:?]
        at me.neutralplasma.holodisplayextension.checks.BalanceChecks.setupBaltop(BalanceChecks.java:99) ~[HolographicDisplaysExtension.jar:?]
        at me.neutralplasma.holodisplayextension.checks.BalanceChecks.baltopuserbalance(BalanceChecks.java:129) ~[HolographicDisplaysExtension.jar:?]
        at me.neutralplasma.holodisplayextension.utils.RegisterPlaceholders$2.update(RegisterPlaceholders.java:73) ~[HolographicDisplaysExtension.jar:?]
        at com.gmail.filoghost.holographicdisplays.placeholder.Placeholder.update(Placeholder.java:78) ~[HolographicDisplays.jar:?]
        at com.gmail.filoghost.holographicdisplays.placeholder.PlaceholdersManager$1.run(PlaceholdersManager.java:68) [HolographicDisplays.jar:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:59) [patched.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:352) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:783) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616) [patched.jar:git-PaperSpigot-"4c7641d"]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]