What is happening?

[13:45:10 WARN]: [ChestShop] Plugin ChestShop v3.12.1-SNAPSHOT (build 343) generated an exception while executing task 33740
java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:67) ~[?:?]
at java.lang.Integer.parseInt(Integer.java:678) ~[?:?]
at java.lang.Integer.parseInt(Integer.java:786) ~[?:?]
at com.Acrobot.Breeze.Utils.QuantityUtil.parseQuantity(QuantityUtil.java:16) ~[ChestShop.jar:?]
at com.Acrobot.ChestShop.Signs.ChestShopSign.getQuantity(ChestShopSign.java:256) ~[ChestShop.jar:?]
at com.Acrobot.ChestShop.Signs.ChestShopSign.getQuantity(ChestShopSign.java:246) ~[ChestShop.jar:?]
at com.Acrobot.ChestShop.Listeners.PostShopCreation.ShopCreationLogger.lambda$onShopCreation$0(ShopCreationLogger.java:24) ~[ChestShop.jar:?]
at org.bukkit.craftbukkit.v1_18_R1.scheduler.CraftTask.run(CraftTask.java:101) ~[purpur-1.18.1.jar:git-Purpur-1551]
at org.bukkit.craftbukkit.v1_18_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:57) ~[purpur-1.18.1.jar:git-Purpur-1551]
at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) ~[purpur-1.18.1.jar:git-Purpur-1551]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[?:?]
at java.lang.Thread.run(Thread.java:833) ~[?:?]

What did you expect to happen?

no error

Plugin Version

ChestShop version 3.12.1-SNAPSHOT (build 343)

Plugin Config

[Put the config here]

Server Version

Current: git-Purpur-1551 (MC: 1.18.1)*

Server Log

[Your log here]

What other plugins are you running?

ChestShop, Chunky, Citizens, ClearLag, CoreProtect, DeluxeMenus, Essentials, EssentialsSpawn, F3Name, FarmingUpgrade

Agreements

• I have checked if there are already similar issues open.
• I am running the latest development version available from https://ci.minebench.de/job/ChestShop-3/.
• The version has support for this type of issue.
• I have provided all requested information and agree to the terms of the project's license

Additional context

No response

Duplicate of #499

If you have information about which sign caused this then please provide that too as this case should not be possible.