[00:15:08 WARN]: [HelmetSet] Plugin HelmetSet v1.0-SNAPSHOT generated an exception while executing task 6033
java.lang.IllegalArgumentException: Player instance is not valid!
        at net.skinsrestorer.bukkit.SkinsRestorer$WrapperFactoryBukkit.wrapPlayer(SkinsRestorer.java:538) ~[?:?]
        at net.skinsrestorer.api.PlayerWrapper.<init>(PlayerWrapper.java:36) ~[?:?]
        at com.evdokimov.helmetset.HelmetSet$1.run(HelmetSet.java:144) ~[?:?]
        at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftTask.run(CraftTask.java:100) ~[patched_1.16.5.jar:git-Purpur-1171]
        at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:58) ~[patched_1.16.5.jar:git-Purpur-1171]
        at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) ~[patched_1.16.5.jar:git-Purpur-1171]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) [?:?]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) [?:?]
        at java.lang.Thread.run(Thread.java:831) [?:?]