An error occurs when registering the second or subsequent product.

An error occurs when registering the second or subsequent product.
The first one was registering a custom helicopter signal.
The second is that no matter what product you try to register, an error will occur and you will not be able to register it. (Example: Vanilla Hammer, registering without entering anything other than the short name)

Also, if you close the shop from this state, you will not be able to open the items in this category (e.g. AttackHeli) even if you click on them. The category will remain.

    {
      "Enabled": true,
      "Category Type": "None",
      "Title": "AttackHeli",
      "Permission": "shop.aheli",
      "Sort Type": "PriceDecrease",
      "Items": [
        {
          "Type": "Item",
          "ID": 1497596493,
          "Image": null,
          "Permission": "",
          "Title": null,
          "Description": "",
          "Command (%steamid%)": null,
          "Kit": "",
          "Plugin": null,
          "DisplayName (empty - default)": "01‗Easy",
          "ShortName": "supply.signal",
          "Skin": 2920175997,
          "Is Blueprint": false,
          "Amount": 1,
          "Enable item buying?": true,
          "Price": 100.0,
          "Enable item selling?": true,
          "Sell Price": 100.0,
          "Buy Cooldown (0 - disable)": 0.0,
          "Buy Cooldowns (0 - no limit)": {},
          "Sell Cooldown (0 - disable)": 0.0,
          "Sell Cooldowns (0 - no limit)": {},
          "Use custom discount?": false,
          "Discount (%)": {},
          "Sell Limits (0 - no limit)": {},
          "Buy Limits (0 - no limit)": {},
          "Daily Buy Limits (0 - no limit)": {},
          "Daily Sell Limits (0 - no limit)": {},
          "Max Buy Amount (0 - disable)": 0,
          "Max Sell Amount (0 - disable)": 0,
          "Force Buy": false,
          "Prohibit splitting item into stacks?": false,
          "Purchase block duration after wipe": 0,
          "Sale block duration after wipe": 0,
          "Localization": {
            "Enabled": false,
            "Text (language - text)": {}
          },
          "Content": {
            "Enabled": false,
            "Contents": []
          },
          "Weapon": {
            "Enabled": false,
            "Ammo Type": null,
            "Ammo Amount": 0
          },
          "Genes": {
            "Enabled": false,
            "Gene types": []
          },
          "Currencies": {
            "Enabled": false,
            "Enabled currency for buying items (key - economy ID, if you use economy by default use 0)": {},
            "Currency for selling items (key - economy ID, if you use economy by default use 0)": {}
          }
        }
      ],
      "Localization": {
        "Enabled": false,
        "Text (language - text)": {
          "en": ""
        }
      }
    },

I contacted chatGPT and found a solution.
I found out that this issue occurs when the sort type is set to PriceIncrease / PriceDecrease.
Setting the sort type to none allows the item to open normally.
I would like to sort by Price, so please check just to be sure.