[15:33:08 WARN]: [TAB] Plugin TAB v2.1.7 generated an exception while executing task 1021
java.util.ConcurrentModificationException: null
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1442) ~[?:1.8.0_161]
at java.util.HashMap$EntryIterator.next(HashMap.java:1476) ~[?:1.8.0_161]
at java.util.HashMap$EntryIterator.next(HashMap.java:1474) ~[?:1.8.0_161]
at me.neznamy.tab.HeaderFooter$1.run(HeaderFooter.java:33) ~[?:?]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:63) ~[patched_1.12.2.jar:git-Paper-1468]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52) [patched_1.12.2.jar:git-Paper-1468]
at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) [patched_1.12.2.jar:git-Paper-1468]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_161]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_161]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161