Server : Purpur 1.20.6-2233
Plugin : Citizens 2.0.35 (ALPHA 1.21 #3)
error log :
[03:53:36 WARN]: java.util.ConcurrentModificationException
[03:53:36 WARN]: at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1095)
[03:53:36 WARN]: at java.base/java.util.ArrayList$Itr.next(ArrayList.java:1049)
[03:53:36 WARN]: at Citizens-2.0.35.jar//net.citizensnpcs.api.npc.AbstractNPC.update(AbstractNPC.java:536)
[03:53:36 WARN]: at Citizens-2.0.35.jar//net.citizensnpcs.npc.CitizensNPC.update(CitizensNPC.java:477)
[03:53:36 WARN]: at Citizens-2.0.35.jar//net.citizensnpcs.nms.v1_20_R4.entity.nonliving.InteractionController$EntityInteractionNPC.tick(InteractionController.java:105)
[03:53:36 WARN]: at net.minecraft.world.entity.Entity.rideTick(Entity.java:2966)
[03:53:36 WARN]: at net.minecraft.server.level.ServerLevel.tickPassenger(ServerLevel.java:1522)
[03:53:36 WARN]: at net.minecraft.server.level.ServerLevel.tickNonPassenger(ServerLevel.java:1492)
[03:53:36 WARN]: at net.minecraft.world.level.Level.guardEntityTick(Level.java:1347)
[03:53:36 WARN]: at net.minecraft.server.level.ServerLevel.lambda$tick$8(ServerLevel.java:943)
[03:53:36 WARN]: at net.minecraft.world.level.entity.EntityTickList.forEach(EntityTickList.java:42)
[03:53:36 WARN]: at net.minecraft.server.level.ServerLevel.tick(ServerLevel.java:923)
[03:53:36 WARN]: at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1815)
[03:53:36 WARN]: at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:503)