Travelers Backpack Crash

Question

Travelers Backpack Crash

jcalla97 opened this issue a month ago · 8 comments

jcalla97 commented a month ago

ALWAYS PROVIDE INFORMATION ABOUT MODLOADER (Fabric / Forge) AND MOD VERSION (For Example 1.19.2-8.2.10)

Modrinth Launcher version 0.9.3
Using Fabric Travelers Backpack version 1.21.1-10.1.15

Describe the bug

Can't open backpack without getting kicked from server due to network protocol error
Only reproducible in server environment. No issue in a single player world
Error is 100% reproducible and my backpack is completely inaccessible

[11:36:52] [Render thread/ERROR]: Failed to handle packet net.minecraft.class_2649@20b7c58c
java.lang.NullPointerException: Cannot invoke "java.util.Optional.isPresent()" because "upgrade" is null
	at knot/com.tiviacz.travelersbackpack.inventory.UpgradeManager.invalidateUpgrade(UpgradeManager.java:259) ~[travelersbackpack-fabric-1.21.1-10.1.15.jar:?]
	at knot/com.tiviacz.travelersbackpack.inventory.UpgradeManager.detectedChange(UpgradeManager.java:194) ~[travelersbackpack-fabric-1.21.1-10.1.15.jar:?]
	at knot/com.tiviacz.travelersbackpack.inventory.BackpackWrapper$2.onContentsChanged(BackpackWrapper.java:527) ~[travelersbackpack-fabric-1.21.1-10.1.15.jar:?]
	at knot/com.tiviacz.travelersbackpack.inventory.handler.ItemStackHandler.setStackInSlot(ItemStackHandler.java:37) ~[travelersbackpack-fabric-1.21.1-10.1.15.jar:?]
	at knot/com.tiviacz.travelersbackpack.inventory.menu.slot.SlotItemHandler.method_7673(SlotItemHandler.java:36) ~[travelersbackpack-fabric-1.21.1-10.1.15.jar:?]
	at knot/net.minecraft.class_1703.method_7610(class_1703.java:599) ~[client-intermediary.jar:?]
	at knot/net.minecraft.class_634.method_11153(class_634.java:1273) ~[client-intermediary.jar:?]
	at knot/net.minecraft.class_2649.method_11439(class_2649.java:52) ~[client-intermediary.jar:?]
	at knot/net.minecraft.class_2649.method_11054(class_2649.java:13) ~[client-intermediary.jar:?]
	at knot/net.minecraft.class_2600.method_11072(class_2600.java:27) ~[client-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_18859(class_1255.java:162) [client-intermediary.jar:?]
	at knot/net.minecraft.class_4093.method_18859(class_4093.java:23) [client-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_16075(class_1255.java:136) [client-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_5383(class_1255.java:121) [client-intermediary.jar:?]
	at knot/net.minecraft.class_310.method_1523(class_310.java:1240) [client-intermediary.jar:?]
	at knot/net.minecraft.class_310.method_1514(class_310.java:882) [client-intermediary.jar:?]
	at knot/net.minecraft.client.main.Main.main(Main.java:256) [client-intermediary.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480) [fabric-loader-0.16.10.jar:?]
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) [fabric-loader-0.16.10.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) [fabric-loader-0.16.10.jar:?]

Write steps to reproduce the bug

Have backpack with Crafting table upgrade.
Tried creating a hammer with the following mod: https://modrinth.com/mod/only-hammers

What is expected behaviour

Travelers backpack should open without kicking me from the server

Screenshots (If applicable)

I have a screen recording for the issue that it won't let me post.

Tiviacz1337 · Answer 1 · 2025-03-08T16:51:37.000Z

Update will be available later today with a fix. This issue occurs because somehow item that is not an upgrade landed in upgrade slot (Probably some 3rd mod interferes). You can reset your backpack by placing it on the ground and using Shift + Right click with blank upgrade in hand on it. It will drop all items from your backpack around and you will be able to put them again to backpack.

jcalla97 · Answer 2 · 2025-03-08T16:51:56.000Z

Looks like the issue is already fixed here: https://github.com/Tiviacz1337/Travelers-Backpack/blob/1.20.1/src/main/java/com/tiviacz/travelersbackpack/inventory/UpgradeManager.java#L259. Just might not be in this specific version of the travelers backpack

jcalla97 · Answer 3 · 2025-03-08T16:52:40.000Z

Did notice in my video that there is a tough block in one of the upgrade slots. Must have happened with my inventory sorting mod

Tiviacz1337 · Answer 4 · 2025-03-08T16:54:35.000Z

Yes thats most likely sorting mod that accidentally put the item in upgrade slot. Its already fixed for 1.20.1 and I will be releasing 1.21.1 Fabric update today

Tiviacz1337 · Answer 5 · 2025-03-10T00:56:54.000Z

https://www.curseforge.com/minecraft/mc-mods/travelers-backpack-fabric

Fixed in 9.1.16

jcalla97 · Answer 6 · 2025-03-10T02:34:04.000Z

I got a new error when opening the same backpack @Tiviacz1337:

Tiviacz1337 · Answer 7 · 2025-03-10T02:36:56.000Z

Reset your backpack by placing it on the ground and using shift right click with blank upgrade in hand. It will drop items from backpack around and get rid of corrupted data

jcalla97 · Answer 8 · 2025-03-10T02:52:16.000Z

Thanks that worked. Appreciate the help

Share to