[10:28:41 INFO]: yegored left the game
[10:28:41 WARN]: [PlayRewards] Plugin PlayRewards v1.0 generated an exception while executing task 21
java.util.ConcurrentModificationException: null
        at java.util.HashMap$HashIterator.nextNode(HashMap.java:1511) ~[?:?]
        at java.util.HashMap$KeyIterator.next(HashMap.java:1534) ~[?:?]
        at me.sturm.playrewards.database.DataContainer.applyChanges(DataContainer.kt:53) ~[?:?]
        at me.sturm.playrewards.RewardsManager$load$3.run(RewardsManager.kt:68) ~[?:?]
        at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:64) ~[patched_1.12.2.jar:git-Paper-1620]
        at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52) ~[patched_1.12.2.jar:git-Paper-1620]
        at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) ~[patched_1.12.2.jar:git-Paper-1620]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[?:?]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[?:?]
        at java.lang.Thread.run(Thread.java:829) [?:?]