Invalid move player packet received when trying to ride a tamed dragon #3306
Comments
Tobias15th commented Dec 16, 2020
Pretty much what it says on the title.
I tried mounting a fire dragon that I hatched from an egg and as soon as I moved, the world shut down; specifically I lost connection from a single player world. Now i am soft locked out of the world and I disconnect before the world can load to do anything.
There is no crash report as the game doesn’t technically crash, all I have is the log from the game output when it happens up to me being disconnected.
20:49:26.293
Error during MiniMap.drawMap(): null (SUPPRESSED)
20:49:26.321
java.lang.NullPointerException
at journeymap.client.ui.minimap.MiniMap.drawMap(MiniMap.java:296)
at journeymap.client.ui.minimap.MiniMap.drawMap(MiniMap.java:174)
at journeymap.client.ui.UIManager.drawMiniMap(UIManager.java:328)
at journeymap.client.forge.event.MiniMapOverlayHandler.onRenderOverlay(MiniMapOverlayHandler.java:103)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_3024_MiniMapOverlayHandler_onRenderOverlay_RenderGameOverlayEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.client.GuiIngameForge.pre(GuiIngameForge.java:907)
at net.minecraftforge.client.GuiIngameForge.func_175180_a(GuiIngameForge.java:119)
at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1098)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1119)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
20:49:26.339
Tobias15th lost connection: Invalid move player packet received
One last thing, I know that the issue is that my position has an NaN value, I have tried to sort out the issue using NBTExplorer using different methods and every time, it returns me to an NaN position.
I am not sure whether I am missing a specific mod that allows the dragons to fly or not.
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Comments
seriallos commented Mar 13, 2018 •
Description of the issue:
I’m encountering several stability issues with skyhooks on a multiplayer server.
Was trying to use skyhook on an insulated LV wire between two powered lanterns on top of wooden posts (the IE treated wood ones) when I got my player into a bad state. Server disconnects me with «Invalid move player packet received» whenever I try to log into the server.
It took me a couple tries to get on the line and I was able to briefly attach successfully. It might be that attaching close to one of the lanterns triggered the disconnect/invalid position.
Crashlog:
First disconnect (note that there are no messages between crafting the skyhook and then actually trying to use it 30 minutes later):
Server logs on connection (Maybe note the NaN in the player position?)
Some stack trace logs from the server when just playing around with the skyhook resulting in a different permanent disconnect loop:
Versions & Modlist
Same mod versions from my other recently created issue: https://pastebin.com/zv75DEnM (this is not a crash log for this issue)
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seriallos commented Mar 13, 2018
One note that might be useful in a README or somewhere is that allow-flight=true is probably desired for an IE server. I haven’t been able to repro the invalid position again but I was able to get the server to kick me for not allowing flying.
seriallos commented Mar 13, 2018
Playing around some more and I’ve gotten myself into a pickle I can’t solve. Getting disconnected every time I try to connect with this showing up in the server logs:
seriallos commented Mar 13, 2018
lgthibault commented Mar 17, 2018 •
10 minutes of RMB spamming yielded no NaNs. However, the game jerks the play around a lot when the hook gets in range of a wire. I also unlocked boat recipes when I stepped into water after succesful sky-hooking.
I looked at https://pastebin.com/X31Xm4Kj
The NPE at MessageSkyhookSync.java:63 is likely a side-effect of losing the connection (connection.writeToNBT())
The NPE at EntitySkylineHook.java:103 possibly also the same ((this.ticksExisted==1&&!world.isRemote))
They repeat 16 times each and there is nothing more there.
ghostshadow commented Apr 21, 2018
malte0811 commented Apr 21, 2018
This is probably fixed in the next IE build (81), see #2937. I’m going to close this, please put a comment here if this happens again with IE 81 or maven build 363+. The existing broken players need to be fixed manually as I said in the other issue.
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Invalid move player packet received / teleporting player to NaN crashes worldsave
Details
Description
In short:
At least ender dragons summoned without a DragonPhase seem to be able to «bug out» and be positioned at x=NaN, y=NaN, z=NaN.
If a player teleports to that dragon, the worldsave crashes and you get the info:
» [Server thread/INFO] :
lost connection: Invalid move player packet received» 
Upon trying to reenter, you enter the world very briefly, then get kicked with the same message, and your worldsave will be unplayable.
No crash report gets produced.
Detailed:
To check on my bugposts related to ender dragons, I entered one of my according bugtest worldsaves.
In this worldsave is a (non-moving) dragon already waiting, summoned with /summon ender_dragon
This time I did not see it and at first thought it was a visual problem (see https://www.youtube.com/watch?v=-7UESPgjZME)
Worldsave is unplayable now, but I always make backups upon entering with a new MC version.
Last time I had entered this worldsave was in 19w07a.
I don’t know what changed since then that the Dragon will be now located at NaN/NaN/NaN if it was not summoned with a DragonPhase.
This also evidently happens to not only newly summoned dragons, but also those which have been already summoned in an older worldsave.
You’ll lose the connection/get kicked with «Invalid move player packet received»
and you’ll get kicked immediately again.
Screenshot of player position NaN 
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