>.... [21:05:29 WARN]: [UltimateKits] Plugin UltimateKits v2.5.2 generated an exception while executing task 150
java.util.ConcurrentModificationException: null
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445) ~[?:1.8.0_242]
at java.util.HashMap$ValueIterator.next(HashMap.java:1474) ~[?:1.8.0_242]
at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1044) ~[?:1.8.0_242]
at com.songoda.ultimatekits.handlers.DisplayItemHandler.displayItems(DisplayItemHandler.java:36) ~[?:?]
at org.bukkit.craftbukkit.v1_15_R1.scheduler.CraftTask.run(CraftTask.java:84) ~[patched_1.15.2.jar:git-Paper-155]
at org.bukkit.craftbukkit.v1_15_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:54) ~[patched_1.15.2.jar:git-Paper-155]
at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) ~[patched_1.15.2.jar:git-Paper-155]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_242]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_242]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_242]
>.... [21:06:24 INFO]: [BuycraftX] Fetching all due players...