[21:22:18 WARN]: [ChunkCollector] Plugin ChunkCollector v0.2 generated an exception while executing task 502036
java.util.ConcurrentModificationException: null
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445) ~[?:1.8.0_212]
at java.util.HashMap$KeyIterator.next(HashMap.java:1469) ~[?:1.8.0_212]
at me.shin1gamix.chunkcoll.collectorhandler.ChunkCollectorItemManager.getSellable(ChunkCollectorItemManager.java:239) ~[?:?]
at me.shin1gamix.chunkcoll.collectorhandler.ChunkCollectorItemManager.getItems(ChunkCollectorItemManager.java:140) ~[?:?]
at me.shin1gamix.chunkcoll.collectorhandler.ChunkCollector.updateInventory(ChunkCollector.java:128) ~[?:?]
at me.shin1gamix.chunkcoll.listeners.MobKillListener.lambda$onSpawn$1(MobKillListener.java:150) ~[?:?]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:64) ~[patched_1.12.2.jar:git-Paper-1613]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52) ~[patched_1.12.2.jar:git-Paper-1613]
at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) ~[patched_1.12.2.jar:git-Paper-1613]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_212]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_212]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]