Minecraft Version

1.18.2

KubeJS Version

1802.5.5-build.546

Rhino Version

1802.2.0-build.232

Architectury Version

4.7.78

Forge/Fabric Version

0.14.9

Describe your issue

mods:
dataattributes:data-attributes-1.1.12
playerex:playerex-3.2.7
relicex:relicex-3.1.4

//script.js

onEvent('item.registry.tool_tiers', event => {
event.add('legend', tier => {
tier.uses = 0.0
tier.speed = 4.0
tier.attackDamageBonus = 0.0
tier.level = 4
tier.enchantmentValue = 99
})})

onEvent('item.registry', event => {
event.create('hibikikatana', 'sword')
.tier('legend')
.glow(true)
.rarity("epic")
.attackDamageBaseline(10.0)
.speedBaseline(-2.4)
})

onEvent('item.modification' , event => {
event.modify(["kubejs:hibikikatana"], modification =>{
modification.addAttribute('minecraft:generic.movement_speed','2b413777-7140-451b-9774-481b9899e52a', "speed", 0.01, "addition")
modification.addAttribute('playerex:lifesteal','f33dd603-3e59-423d-9c9e-7cbd1444f59b', "x", 1 ,"addition")
})})

Thankfull! :D

Crash report/logs

https://paste.ubuntu.org.cn/4546611

Urgh, I'm assuming the attribute doesn't yet exist by the time you're trying to modify the item?

Its mean, those attributes isn't registry when the event running?

"java.lang.NullPointerException: Cannot invoke "Object.equals(Object)" because the return value of "java.util.Map$Entry.getKey()" is null"

That was a priorities problem？

I guess.