Manipulating the y (vector expression) of a block throws error

[ShaneBeee]

Skript/Server Version

[16:47:42 INFO]: [Skript] Skript's aliases can be found here: https://github.com/SkriptLang/skript-aliases
[16:47:42 INFO]: [Skript] Skript's documentation can be found here: https://docs.skriptlang.org/
[16:47:42 INFO]: [Skript] Skript's tutorials can be found here: https://docs.skriptlang.org/tutorials
[16:47:42 INFO]: [Skript] Server Version: git-Paper-405 (MC: 1.20.4)
[16:47:42 INFO]: [Skript] Skript Version: 2.8.1 (skriptlang-github)
[16:47:42 INFO]: [Skript] Installed Skript Addons: 
[16:47:42 INFO]: [Skript]  - skript-reflect v2.4 (https://github.com/SkriptLang/skript-reflect)
[16:47:42 INFO]: [Skript]  - SkBee v3.2.1 (https://github.com/ShaneBeee/SkBee)
[16:47:42 INFO]: [Skript] Installed dependencies: 
[16:47:42 INFO]: [Skript]  - Vault v1.7.3-b131

Bug Description

This was found in a help channel
using this code:

on load:
	set {_b} to block at location(1,1,1)
	add 1 to y of {_b}

throws an error in console

error:

[16:45:20 ERROR]: #!#! 
[16:45:20 ERROR]: #!#! [Skript] Severe Error:
[16:45:20 ERROR]: #!#! 
[16:45:20 ERROR]: #!#! Something went horribly wrong with Skript.
[16:45:20 ERROR]: #!#! This issue is NOT your fault! You probably can't fix it yourself, either.
[16:45:20 ERROR]: #!#! It looks like you are using some plugin(s) that alter how Skript works (addons).
[16:45:20 ERROR]: #!#! Here is full list of them:
[16:45:20 ERROR]: #!#! skript-reflect v2.4 (https://github.com/SkriptLang/skript-reflect) SkBee v3.2.1 (https://github.com/ShaneBeee/SkBee) 
[16:45:20 ERROR]: #!#! We could not identify which of those are specially related, so this might also be Skript issue.
[16:45:20 ERROR]: #!#! You should try disabling those plugins one by one, trying to find which one causes it.
[16:45:20 ERROR]: #!#! If the error doesn't disappear even after disabling all listed plugins, it is probably Skript issue.
[16:45:20 ERROR]: #!#! In that case, you will be given instruction on how should you report it.
[16:45:20 ERROR]: #!#! On the other hand, if the error disappears when disabling some plugin, report it to author of that plugin.
[16:45:20 ERROR]: #!#! Only if the author tells you to do so, report it to Skript's issue tracker.
[16:45:20 ERROR]: #!#! 
[16:45:20 ERROR]: #!#! Stack trace:
[16:45:20 ERROR]: #!#! java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.lang.Variable.change(Variable.java:550)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.expressions.ExprVectorXYZ.change(ExprVectorXYZ.java:116)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.effects.EffChange.execute(EffChange.java:292)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.lang.Effect.run(Effect.java:49)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:61)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:88)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.lang.Trigger.execute(Trigger.java:52)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.events.EvtScript.runTrigger(EvtScript.java:88)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.events.EvtScript.postLoad(EvtScript.java:61)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.structures.StructEvent.postLoad(StructEvent.java:79)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.ScriptLoader.lambda$loadScripts$9(ScriptLoader.java:589)
[16:45:20 ERROR]: #!#!     at java.base/java.util.ArrayList.removeIf(ArrayList.java:1672)
[16:45:20 ERROR]: #!#!     at java.base/java.util.ArrayList.removeIf(ArrayList.java:1660)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.ScriptLoader.lambda$loadScripts$10(ScriptLoader.java:581)
[16:45:20 ERROR]: #!#!     at java.base/java.util.concurrent.CompletableFuture.uniApplyNow(CompletableFuture.java:684)
[16:45:20 ERROR]: #!#!     at java.base/java.util.concurrent.CompletableFuture.uniApplyStage(CompletableFuture.java:662)
[16:45:20 ERROR]: #!#!     at java.base/java.util.concurrent.CompletableFuture.thenApply(CompletableFuture.java:2200)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.ScriptLoader.loadScripts(ScriptLoader.java:511)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.ScriptLoader.loadScripts(ScriptLoader.java:457)
[16:45:20 ERROR]: #!#!     at Skript.jar//ch.njol.skript.SkriptCommand.onCommand(SkriptCommand.java:190)
[16:45:20 ERROR]: #!#!     at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45)
[16:45:20 ERROR]: #!#!     at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:155)
[16:45:20 ERROR]: #!#!     at org.bukkit.craftbukkit.v1_20_R3.CraftServer.dispatchCommand(CraftServer.java:987)
[16:45:20 ERROR]: #!#!     at org.bukkit.craftbukkit.v1_20_R3.CraftServer.dispatchServerCommand(CraftServer.java:972)
[16:45:20 ERROR]: #!#!     at net.minecraft.server.dedicated.DedicatedServer.bk(DedicatedServer.java:500)
[16:45:20 ERROR]: #!#!     at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:447)
[16:45:20 ERROR]: #!#!     at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1515)
[16:45:20 ERROR]: #!#!     at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1216)
[16:45:20 ERROR]: #!#!     at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319)
[16:45:20 ERROR]: #!#!     at java.base/java.lang.Thread.run(Thread.java:1623)
[16:45:20 ERROR]: #!#! 
[16:45:20 ERROR]: #!#! Version Information:
[16:45:20 ERROR]: #!#!   Skript: 2.8.1 (latest)
[16:45:20 ERROR]: #!#!     Flavor: skriptlang-github
[16:45:20 ERROR]: #!#!     Date: 18:12:02.401265400
[16:45:20 ERROR]: #!#!   Bukkit: 1.20.4-R0.1-SNAPSHOT
[16:45:20 ERROR]: #!#!   Minecraft: 1.20.4
[16:45:20 ERROR]: #!#!   Java: 20.0.2 (OpenJDK 64-Bit Server VM 20.0.2+9)
[16:45:20 ERROR]: #!#!   OS: Mac OS X aarch64 14.3
[16:45:20 ERROR]: #!#! 
[16:45:20 ERROR]: #!#! Server platform: Paper
[16:45:20 ERROR]: #!#! 
[16:45:20 ERROR]: #!#! Current node: on load: (test.sk, line 2)
[16:45:20 ERROR]: #!#! Current item: add [[long:1]] to y component of {_v} (as org.bukkit.util.Vector)
[16:45:20 ERROR]: #!#! Current trigger: load (script load) (test.sk, line 2)
[16:45:20 ERROR]: #!#! 
[16:45:20 ERROR]: #!#! Thread: Server thread
[16:45:20 ERROR]: #!#! 
[16:45:20 ERROR]: #!#! Language: english
[16:45:20 ERROR]: #!#! Link parse mode: DISABLED
[16:45:20 ERROR]: #!#! 
[16:45:20 ERROR]: #!#! End of Error.
[16:45:20 ERROR]: #!#! 

Expected Behavior

no error

Steps to Reproduce

see above

Errors or Screenshots

No response

Other

No response

Agreement

• I have read the guidelines above and affirm I am following them with this report.

[APickledWalrus]

It looks like it's a simple fix of checking that vectors array is not empty