gistfile1.txt

[23:56:34 WARN]: [GriefDefender] Task #6629 for GriefDefender v1.4.7 generated an exception
java.util.NoSuchElementException: null
        at java.util.ArrayDeque.removeFirst(Unknown Source) ~[?:1.8.0_251]
        at java.util.ArrayDeque.pop(Unknown Source) ~[?:1.8.0_251]
        at com.griefdefender.event.GDCauseStackManager.popCause(GDCauseStackManager.java:83) ~[?:?]
        at com.griefdefender.command.ClaimFlagBase.lambda$null$0(ClaimFlagBase.java:1133) ~[?:?]
        at org.bukkit.craftbukkit.v1_16_R1.scheduler.CraftTask.run(CraftTask.java:99) ~[patched_1.16.1.jar:git-Paper-90]
        at org.bukkit.craftbukkit.v1_16_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:468) ~[patched_1.16.1.jar:git-Paper-90]
        at net.minecraft.server.v1_16_R1.MinecraftServer.b(MinecraftServer.java:1291) ~[patched_1.16.1.jar:git-Paper-90]
        at net.minecraft.server.v1_16_R1.DedicatedServer.b(DedicatedServer.java:377) ~[patched_1.16.1.jar:git-Paper-90]
        at net.minecraft.server.v1_16_R1.MinecraftServer.a(MinecraftServer.java:1212) ~[patched_1.16.1.jar:git-Paper-90]
        at net.minecraft.server.v1_16_R1.MinecraftServer.v(MinecraftServer.java:1000) ~[patched_1.16.1.jar:git-Paper-90]
        at net.minecraft.server.v1_16_R1.MinecraftServer.lambda$a$0(MinecraftServer.java:177) ~[patched_1.16.1.jar:git-Paper-90]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_251]