My client log below.
(I disable all other mods except this one to test. Most other items are OK. But game crashs when i reforge Zenith Sword.)

System.NullReferenceException: Object reference not set to an instance of an object.
at Terraria.PopupText.NewText(PopupTextContext context, Item newItem, Int32 stack, Boolean noStack, Boolean longText) in tModLoader\Terraria\PopupText.cs:line 418
at MultiReforge.UpgradeUIState.tinker(Boolean one) in MultiReforge\ReforgeUI.cs:line 225
at Terraria.UI.UIElement.LeftClick(UIMouseEvent evt) in tModLoader\Terraria\UI\UIElement.cs:line 424
at Terraria.UI.UserInterface.<>c.<.ctor>b__21_2(UIElement element, UIMouseEvent evt) in tModLoader\Terraria\UI\UserInterface.cs:line 47
at Terraria.UI.UserInterface.HandleClick(InputPointerCache cache, GameTime time, Boolean isDown, UIElement mouseElement) in tModLoader\Terraria\UI\UserInterface.cs:line 214
at Terraria.UI.UserInterface.Update_Inner(GameTime time, UIElement uIElement, Boolean& num) in tModLoader\Terraria\UI\UserInterface.cs:line 176
at Terraria.UI.UserInterface.Update(GameTime time) in tModLoader\Terraria\UI\UserInterface.cs:line 154
at Terraria.ModLoader.SystemLoader.UpdateUI(GameTime gameTime) in tModLoader\Terraria\ModLoader\SystemLoader.cs:line 269
at Terraria.Main.UpdateUIStates(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 14956
at Terraria.Main.DoUpdate(GameTime& gameTime) in tModLoader\Terraria\Main.cs:line 14542
at Terraria.Main.Update(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 14321
at Microsoft.Xna.Framework.Game.Tick() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 546
at Microsoft.Xna.Framework.Game.RunLoop() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 878
at Microsoft.Xna.Framework.Game.Run() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 419
at Terraria.Program.RunGame() in tModLoader\Terraria\Program.cs:line 266
at Terraria.Program.LaunchGame_(Boolean isServer) in tModLoader\Terraria\Program.cs:line 240
at Terraria.Program.LaunchGame(String[] args, Boolean monoArgs) in tModLoader\Terraria\Program.cs:line 213
at Terraria.MonoLaunch.Main_End(String[] args) in tModLoader\Terraria\MonoLaunch.cs:line 79
at Terraria.MonoLaunch.<>c__DisplayClass1_0.<Main>b__1() in tModLoader\Terraria\MonoLaunch.cs:line 65

[22:11:13.067] [Main Thread/WARN] [tML]: 静默捕获异常:
System.NullReferenceException: Object reference not set to an instance of an object.
at ReLogic.Graphics.DynamicSpriteFont.MeasureString(String text) in D:\a\tModLoader\tModLoader\src\tModLoader\ReLogic\Graphics\DynamicSpriteFont.cs:line 155
at Terraria.Main.DrawItemTextPopups(Single scaleTarget) in tModLoader\Terraria\Main.cs:line 53951
at Terraria.Main.DoDraw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53859
at Terraria.Main.Draw_Inner(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53162
at Terraria.Main.Draw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53149
at Microsoft.Xna.Framework.Game.Tick() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 562
at Microsoft.Xna.Framework.Game.RunLoop() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 878
at Microsoft.Xna.Framework.Game.Run() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 419
at Terraria.Program.RunGame() in tModLoader\Terraria\Program.cs:line 266
at Terraria.Program.LaunchGame_(Boolean isServer) in tModLoader\Terraria\Program.cs:line 240
at Terraria.Program.LaunchGame(String[] args, Boolean monoArgs) in tModLoader\Terraria\Program.cs:line 213
at Terraria.MonoLaunch.Main_End(String[] args) in tModLoader\Terraria\MonoLaunch.cs:line 79
at Terraria.MonoLaunch.<>c__DisplayClass1_0.<Main>b__1() in tModLoader\Terraria\MonoLaunch.cs:line 65

[22:11:13.068] [Main Thread/ERROR] [Terraria]: System.NullReferenceException: Object reference not set to an instance of an object.
at ReLogic.Graphics.DynamicSpriteFont.MeasureString(String text) in D:\a\tModLoader\tModLoader\src\tModLoader\ReLogic\Graphics\DynamicSpriteFont.cs:line 155
at Terraria.Main.DrawItemTextPopups(Single scaleTarget) in tModLoader\Terraria\Main.cs:line 53951
at Terraria.Main.DoDraw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53859
at Terraria.Main.Draw_Inner(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53162
at Terraria.Main.Draw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53149
[22:11:13.097] [Main Thread/FATAL] [tML]: Main engine crash

提示：很有可能是哪个模组崩溃了。你可以试着逐个禁用模组看看问题是否仍会重复出现。

System.NullReferenceException: Object reference not set to an instance of an object.
at ReLogic.Graphics.DynamicSpriteFont.MeasureString(String text) in D:\a\tModLoader\tModLoader\src\tModLoader\ReLogic\Graphics\DynamicSpriteFont.cs:line 155
at Terraria.Main.DrawItemTextPopups(Single scaleTarget) in tModLoader\Terraria\Main.cs:line 53951
at Terraria.Main.DoDraw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53859
at Terraria.Main.Draw_Inner(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53162
at Terraria.Main.Draw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53149
at Microsoft.Xna.Framework.Game.Tick() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 562
at Microsoft.Xna.Framework.Game.RunLoop() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 878
at Microsoft.Xna.Framework.Game.Run() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 419
at Terraria.Program.RunGame() in tModLoader\Terraria\Program.cs:line 266
[22:11:13.099] [Main Thread/DEBUG] [TerrariaSteamClient]: Send: shutdown

Game will crash randomly when I reforge a (zenith sword without any prefix) for the first time ,first time reforge button click.
There is a certain probability that I can reforge two Multi-Prefix Zenith Sword successfully.
But game also crashed randomly when I reforge one of its prefixs.

do you have the pickup text setting off in the interface settings

i forgot to account for people that dont have that setting on so it could be because of that, regardless ill post an fix for thje pickup text thing now.

please do tell me if the bug persists.

Originally posted by Breadcast:

i forgot to account for people that dont have that setting on so it could be because of that, regardless ill post an fix for thje pickup text thing now.

You are right!
I turn it off,now no more game crash.Thank you!

I notice there are no crash with pickup text setting off,
Although I can reforge a zenith sword with a blank description(it has two prefixs actually),there is no information about this item.
I don't know how it happened,I am sure this is the same bug(Game crash bug).
Because if I drop the blank-description one and pick it up with the setting on,game will crash too.
I am not a modder of terraria,and I don't know program.But I like this mod and I hope there is a way to solve the issue.

cant recreate that one can you send the new crash logs

https://steamcommunity.com/sharedfiles/filedetails/?id=3541881604

Dear author,can you try reforge zenith sword and change the prefix's combination for more times?
Some combinations display normal,some are blank.My screenshot is above.

works fine for me

send the crash logs when you pick up the bugged zenith if they are different from before they will help me the most

I don't know why the mod works fine for you.I tested it without other mods.
I readed my crash reports,I think it may be a limitation of the game.
I tested different rarities items.The rarity of an item is the key to the problem.

I found the blank-description-issue only happens on an item with a rarity level higher than 8.
(game will crash if I pick up the-blank-description item with the pickup setting on.If I turn it off,game will not crash,I can see the blank-description item with some combination of Multi-Prefix.)

My log is below.

[21:08:34.773] [.NET TP Worker/INFO] [tML]: 查找模组……
[21:08:34.781] [.NET TP Worker/INFO] [tML]: 加载程序集: MultiReforge (Multi-Prefix) v0.5.5
[21:08:34.809] [.NET TP Worker/INFO] [tML]: 初始化……
[21:08:34.812] [.NET TP Worker/INFO] [tML]: 自动加载中：ModLoader (tModLoader) v2025.6.3.0
[21:08:34.821] [.NET TP Worker/INFO] [tML]: JITModsAsync completed in 11ms
[21:08:34.840] [.NET TP Worker/INFO] [tML]: 自动加载中：MultiReforge (Multi-Prefix) v0.5.5
[21:08:34.915] [.NET TP Worker/WARN] [tML]: MultiReforge spent 63ms blocking on asset loading. Avoid using AssetRequestMode.ImmediateLoad during mod loading where possible
[21:08:34.915] [.NET TP Worker/INFO] [tML]: 增容中……
[21:08:35.102] [.NET TP Worker/INFO] [tML]: 特殊调整内容：ModLoader (tModLoader) v2025.6.3.0
[21:08:35.105] [.NET TP Worker/INFO] [tML]: 特殊调整内容：MultiReforge (Multi-Prefix) v0.5.5
[21:08:35.148] [.NET TP Worker/INFO] [tML]: 完成最后步骤：ModLoader (tModLoader) v2025.6.3.0
[21:08:35.150] [.NET TP Worker/INFO] [tML]: 完成最后步骤：MultiReforge (Multi-Prefix) v0.5.5
[21:08:35.153] [.NET TP Worker/INFO] [tML]: Mods using the most RAM: MultiReforge 1.4 MB
[21:08:35.161] [.NET TP Worker/INFO] [tML]: RAM physical: tModLoader usage: 1.0 GB, All processes usage: 9.7 GB, Available: 22.0 GB, Total Installed: 31.7 GB
[21:08:35.161] [.NET TP Worker/INFO] [tML]: RAM virtual: tModLoader usage: 1.5 GB, All processes usage: 6.7 GB
[21:08:35.199] [.NET TP Worker/DEBUG] [tML]: GlobalItem registration stats. Count: 2, Slots per Entity: 2
Instanced: 2, Conditional with slot: 0, Conditional by type: 0, Applies to single type: 0
List Permutations: 1, Est Memory Consumption: 16 bytes
[21:08:35.213] [.NET TP Worker/DEBUG] [tML]: GlobalNPC registration stats. Count: 3, Slots per Entity: 1
Instanced: 1, Conditional with slot: 0, Conditional by type: 0, Applies to single type: 0
List Permutations: 1, Est Memory Consumption: 16 bytes
[21:08:35.217] [.NET TP Worker/DEBUG] [tML]: GlobalProjectile registration stats. Count: 0, Slots per Entity: 0
Instanced: 0, Conditional with slot: 0, Conditional by type: 0, Applies to single type: 0
List Permutations: 0, Est Memory Consumption: 0 bytes
[21:08:35.279] [.NET TP Worker/INFO] [tML]: 添加合成配方……
[21:08:35.335] [.NET TP Worker/INFO] [tML]: Finding Mods...
[21:08:35.370] [.NET TP Worker/INFO] [tML]: Mod Load Completed in 598ms
[21:08:35.397] [Main Thread/DEBUG] [tML]: Web Request: https://api.steampowered.com/ISteamNews/GetNewsForApp/v2/?appid=1281930&count=1&feeds=steam_community_announcements
[21:08:45.250] [.NET TP Worker/INFO] [Terraria]: Loading World: 猛烈的气味精华之地, IsCloud=False, Width: 6400, Height: 1800, Evil: 0, GameMode: 3
[21:08:45.262] [.NET TP Worker/INFO] [StatusText]: 正在加载世界数据：
[21:08:45.579] [.NET TP Worker/INFO] [StatusText]: 正在安置液体
[21:08:45.910] [.NET TP Worker/INFO] [StatusText]: 正在加载地图数据：
[21:08:46.145] [.NET TP Worker/INFO] [StatusText]: 正在绘制地图：
[21:08:46.181] [Main Thread/INFO] [Terraria]: Entering world with player: 1, IsCloud=False, Width: 6400, Height: 1800, Evil: 0, GameMode: 3
[21:09:02.049] [Main Thread/DEBUG] [tML]: Assembly Resolve: System.Reflection.Metadata, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a -> System.Reflection.Metadata.resources, Version=8.0.0.0, Culture=zh-Hans, PublicKeyToken=b03f5f7f11d50a3a
[21:09:02.049] [Main Thread/DEBUG] [tML]: Assembly Resolve: System.Reflection.Metadata, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a -> System.Reflection.Metadata.resources, Version=8.0.0.0, Culture=zh, PublicKeyToken=b03f5f7f11d50a3a
[21:09:02.050] [Main Thread/WARN] [tML]: 静默捕获异常:
System.NullReferenceException: Object reference not set to an instance of an object.
at Terraria.Main.MouseText_DrawItemTooltip(MouseTextCache info, Int32 rare, Byte diff, Int32 X, Int32 Y) in tModLoader\Terraria\Main.cs:line 17407
at Terraria.Main.MouseTextInner(MouseTextCache info) in tModLoader\Terraria\Main.cs:line 17034
at Terraria.Main.DrawPendingMouseText() in tModLoader\Terraria\Main.cs:line 38344
at Terraria.Main.DrawInterface_41_InterfaceLogic4() in tModLoader\Terraria\Main.cs:line 38336
at Terraria.Main.<>c.<SetupDrawInterfaceLayers>b__1627_38() in tModLoader\Terraria\Main.cs:line 38245
at Terraria.UI.GameInterfaceLayer.Draw() in tModLoader\Terraria\UI\GameInterfaceLayer.cs:line 25
at Terraria.Main.DrawInterface(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 38270
at Terraria.Main.DoDraw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53884
at Terraria.Main.Draw_Inner(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53162
at Terraria.Main.Draw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53149
at Microsoft.Xna.Framework.Game.Tick() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 562
at Microsoft.Xna.Framework.Game.RunLoop() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 878
at Microsoft.Xna.Framework.Game.Run() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 419
at Terraria.Program.RunGame() in tModLoader\Terraria\Program.cs:line 266
at Terraria.Program.LaunchGame_(Boolean isServer) in tModLoader\Terraria\Program.cs:line 240
at Terraria.Program.LaunchGame(String[] args, Boolean monoArgs) in tModLoader\Terraria\Program.cs:line 213
at Terraria.MonoLaunch.Main_End(String[] args) in tModLoader\Terraria\MonoLaunch.cs:line 79
at Terraria.MonoLaunch.<>c__DisplayClass1_0.<Main>b__1() in tModLoader\Terraria\MonoLaunch.cs:line 65

[21:09:24.878] [Main Thread/WARN] [tML]: 静默捕获异常:
System.NullReferenceException: Object reference not set to an instance of an object.
at Terraria.PopupText.NewText(PopupTextContext context, Item newItem, Int32 stack, Boolean noStack, Boolean longText) in tModLoader\Terraria\PopupText.cs:line 418
at Terraria.Player.GetItem_FillEmptyInventorySlot(Int32 plr, Item newItem, GetItemSettings settings, Item returnItem, Int32 i) in tModLoader\Terraria\Player.cs:line 32580
at Terraria.Player.GetItem(Int32 plr, Item newItem, GetItemSettings settings) in tModLoader\Terraria\Player.cs:line 32387
at Terraria.Player.PickupItem(Int32 playerIndex, Int32 worldItemArrayIndex, Item itemToPickUp) in tModLoader\Terraria\Player.cs:line 28746
at Terraria.Player.GrabItems(Int32 i) in tModLoader\Terraria\Player.cs:line 28620
at Terraria.Player.Update(Int32 i) in tModLoader\Terraria\Player.cs:line 22674
at Terraria.Main.DoUpdateInWorld(Stopwatch sw) in tModLoader\Terraria\Main.cs:line 15148
at Terraria.Main.DoUpdate(GameTime& gameTime) in tModLoader\Terraria\Main.cs:line 14784
at Terraria.Main.Update(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 14321
at Microsoft.Xna.Framework.Game.Tick() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 546
at Microsoft.Xna.Framework.Game.RunLoop() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 878
at Microsoft.Xna.Framework.Game.Run() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 419
at Terraria.Program.RunGame() in tModLoader\Terraria\Program.cs:line 266
at Terraria.Program.LaunchGame_(Boolean isServer) in tModLoader\Terraria\Program.cs:line 240
at Terraria.Program.LaunchGame(String[] args, Boolean monoArgs) in tModLoader\Terraria\Program.cs:line 213
at Terraria.MonoLaunch.Main_End(String[] args) in tModLoader\Terraria\MonoLaunch.cs:line 79
at Terraria.MonoLaunch.<>c__DisplayClass1_0.<Main>b__1() in tModLoader\Terraria\MonoLaunch.cs:line 65

[21:09:24.882] [Main Thread/WARN] [tML]: 静默捕获异常:
System.NullReferenceException: Object reference not set to an instance of an object.
at ReLogic.Graphics.DynamicSpriteFont.MeasureString(String text) in D:\a\tModLoader\tModLoader\src\tModLoader\ReLogic\Graphics\DynamicSpriteFont.cs:line 155
at Terraria.PopupText.GetTextHitbox() in tModLoader\Terraria\PopupText.cs:line 701
at Terraria.PopupText.Update(Int32 whoAmI) in tModLoader\Terraria\PopupText.cs:line 641
at Terraria.PopupText.UpdateItemText() in tModLoader\Terraria\PopupText.cs:line 716
at Terraria.Main.DoUpdateInWorld(Stopwatch sw) in tModLoader\Terraria\Main.cs:line 15338
at Terraria.Main.DoUpdate(GameTime& gameTime) in tModLoader\Terraria\Main.cs:line 14784
at Terraria.Main.Update(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 14321
at Microsoft.Xna.Framework.Game.Tick() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 546
at Microsoft.Xna.Framework.Game.RunLoop() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 878
at Microsoft.Xna.Framework.Game.Run() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 419
at Terraria.Program.RunGame() in tModLoader\Terraria\Program.cs:line 266
at Terraria.Program.LaunchGame_(Boolean isServer) in tModLoader\Terraria\Program.cs:line 240
at Terraria.Program.LaunchGame(String[] args, Boolean monoArgs) in tModLoader\Terraria\Program.cs:line 213
at Terraria.MonoLaunch.Main_End(String[] args) in tModLoader\Terraria\MonoLaunch.cs:line 79
at Terraria.MonoLaunch.<>c__DisplayClass1_0.<Main>b__1() in tModLoader\Terraria\MonoLaunch.cs:line 65

[21:09:24.889] [Main Thread/WARN] [tML]: 静默捕获异常:
System.NullReferenceException: Object reference not set to an instance of an object.
at ReLogic.Graphics.DynamicSpriteFont.MeasureString(String text) in D:\a\tModLoader\tModLoader\src\tModLoader\ReLogic\Graphics\DynamicSpriteFont.cs:line 155
at Terraria.Main.DrawItemTextPopups(Single scaleTarget) in tModLoader\Terraria\Main.cs:line 53951
at Terraria.Main.DoDraw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53859
at Terraria.Main.Draw_Inner(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53162
at Terraria.Main.Draw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53149
at Microsoft.Xna.Framework.Game.Tick() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 562
at Microsoft.Xna.Framework.Game.RunLoop() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 878
at Microsoft.Xna.Framework.Game.Run() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 419
at Terraria.Program.RunGame() in tModLoader\Terraria\Program.cs:line 266
at Terraria.Program.LaunchGame_(Boolean isServer) in tModLoader\Terraria\Program.cs:line 240
at Terraria.Program.LaunchGame(String[] args, Boolean monoArgs) in tModLoader\Terraria\Program.cs:line 213
at Terraria.MonoLaunch.Main_End(String[] args) in tModLoader\Terraria\MonoLaunch.cs:line 79
at Terraria.MonoLaunch.<>c__DisplayClass1_0.<Main>b__1() in tModLoader\Terraria\MonoLaunch.cs:line 65

[21:09:24.890] [Main Thread/ERROR] [Terraria]: System.NullReferenceException: Object reference not set to an instance of an object.
at ReLogic.Graphics.DynamicSpriteFont.MeasureString(String text) in D:\a\tModLoader\tModLoader\src\tModLoader\ReLogic\Graphics\DynamicSpriteFont.cs:line 155
at Terraria.Main.DrawItemTextPopups(Single scaleTarget) in tModLoader\Terraria\Main.cs:line 53951
at Terraria.Main.DoDraw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53859
at Terraria.Main.Draw_Inner(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53162
at Terraria.Main.Draw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53149
[21:09:25.813] [Main Thread/FATAL] [tML]: Main engine crash

提示：很有可能是哪个模组崩溃了。你可以试着逐个禁用模组看看问题是否仍会重复出现。

System.NullReferenceException: Object reference not set to an instance of an object.
at ReLogic.Graphics.DynamicSpriteFont.MeasureString(String text) in D:\a\tModLoader\tModLoader\src\tModLoader\ReLogic\Graphics\DynamicSpriteFont.cs:line 155
at Terraria.Main.DrawItemTextPopups(Single scaleTarget) in tModLoader\Terraria\Main.cs:line 53951
at Terraria.Main.DoDraw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53859
at Terraria.Main.Draw_Inner(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53162
at Terraria.Main.Draw(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 53149
at Microsoft.Xna.Framework.Game.Tick() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 562
at Microsoft.Xna.Framework.Game.RunLoop() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 878
at Microsoft.Xna.Framework.Game.Run() in D:\a\tModLoader\tModLoader\FNA\src\Game.cs:line 419
at Terraria.Program.RunGame() in tModLoader\Terraria\Program.cs:line 266
[21:09:25.814] [Main Thread/DEBUG] [TerrariaSteamClient]: Send: shutdown

oh yeah i think i found the issue

the rarity could go up to 12 which is not a real rarity that exists so it would cause that and crashes

but for me there was a 12th rarity because i forgot to turn off one of my other mods that had a new custom rarity