When you toggle the npc to glow, the npc goes invisible and this is spammed in the console:
! [Tue 13:50:35 WARN ServersNPC] Plugin ServersNPC v3.7 generated an exception while executing task 11
java.lang.AssertionError: can't invoke method: updateScoreboard
at znpc-servers.jar//io.github.znetworkw.znpcservers.npc.packet.PacketCache.lambda$getOrCache$0(PacketCache.java:103)
at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708)
at znpc-servers.jar//io.github.znetworkw.znpcservers.npc.packet.PacketCache.getOrCache(PacketCache.java:97)
at znpc-servers.jar//io.github.znetworkw.znpcservers.npc.packet.PacketCache.access$000(PacketCache.java:21)
at znpc-servers.jar//io.github.znetworkw.znpcservers.npc.packet.PacketCache$PacketHandler.invoke(PacketCache.java:156)
at znpc-servers.jar/jdk.proxy7/jdk.proxy7.$Proxy69.updateScoreboard(Unknown Source)
at znpc-servers.jar//io.github.znetworkw.znpcservers.npc.NPC.spawn(NPC.java:309)
at znpc-servers.jar//io.github.znetworkw.znpcservers.npc.task.NPCManagerTask.run(NPCManagerTask.java:41)
at org.bukkit.craftbukkit.v1_19_R1.scheduler.CraftTask.run(CraftTask.java:101)
at org.bukkit.craftbukkit.v1_19_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:57)
at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at znpc-servers.jar//io.github.znetworkw.znpcservers.npc.pac
When you toggle the npc to glow, the npc goes invisible and this is spammed in the console: