Fix IndexOutOfRangeException at TaleWorlds.CampaignSystem.Roster.TroopRoster.AddToCountsAtIndex

Bannerlord Fix IndexOutOfRangeException at TaleWorlds.CampaignSystem.Roster.TroopRoster.AddToCountsAtIndex

1. Get dnSpy here:
https://github.com/dnSpy/dnSpy/releases

2. Extract and run dnSpy.exe.

3. Go to
C:\Program Files (x86)\Steam\steamapps\common\Mount & Blade II Bannerlord\bin\Win64_Shipping_Client

4. Make a copy of TaleWorlds.CampaignSystem.dll just in case.

5. Drag relevant libraries into dnSpy (left window thing), we want to edit TaleWorlds.CampaignSystem.dll so drag that in, might have to drag other ones in as well, I forgot.

6. In the toolbar at the top, go Edit -> Search Assemblies. Search for AddToCountsAtIndex and double click the result.

7. Right click on AddToCountsAtIndex and press Edit Method (C#)...

8. Replace the text with this:

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using TaleWorlds.CampaignSystem.Party;
using TaleWorlds.Core;
using TaleWorlds.Library;
using TaleWorlds.SaveSystem;

namespace TaleWorlds.CampaignSystem.Roster
{
	// Token: 0x0200028C RID: 652
	public partial class TroopRoster : ISerializableObject
	{
		// Token: 0x06002222 RID: 8738
		public int AddToCountsAtIndex(int index, int countChange, int woundedCountChange = 0, int xpChange = 0, bool removeDepleted = true)
		{
			try
			{
				this.UpdateVersion();
				bool heroCountChanged = false;
				CharacterObject character = this.data[index].Character;
				bool isHero = character.IsHero;
				TroopRosterElement[] array = this.data;
				int num = index;
				array[num].Number = array[num].Number + countChange;
				int num2 = this.data[index].WoundedNumber + woundedCountChange;
				if (num2 > this.data[index].Number)
				{
					woundedCountChange += this.data[index].Number - num2;
				}
				else if (num2 < 0)
				{
					TaleWorlds.Library.Debug.FailedAssert("false", "C:\\Develop\\MB3\\Source\\Bannerlord\\TaleWorlds.CampaignSystem\\Roster\\TroopRoster.cs", "AddToCountsAtIndex", 426);
				}
				TroopRosterElement[] array2 = this.data;
				int num3 = index;
				array2[num3].WoundedNumber = array2[num3].WoundedNumber + woundedCountChange;
				if (xpChange != 0)
				{
					TroopRosterElement[] array3 = this.data;
					int num4 = index;
					array3[num4].Xp = array3[num4].Xp + xpChange;
				}
				if (this.IsPrisonRoster)
				{
					this.ClampConformity(index);
				}
				else
				{
					this.ClampXp(index);
				}
				if (isHero)
				{
					this._totalHeroes += countChange;
					if (character.HeroObject.IsWounded)
					{
						this._totalWoundedHeroes += countChange;
					}
					if (countChange != 0)
					{
						heroCountChanged = true;
					}
				}
				else
				{
					this._totalWoundedRegulars += woundedCountChange;
					this._totalRegulars += countChange;
				}
				if (removeDepleted && this.data[index].Number == 0)
				{
					this.RemoveRange(index, index + 1);
					index = -1;
				}
				if (this.OwnerParty != null && isHero)
				{
					if (countChange > 0)
					{
						if (!this.IsPrisonRoster)
						{
							this.OwnerParty.OnHeroAdded(character.HeroObject);
						}
						else
						{
							this.OwnerParty.OnHeroAddedAsPrisoner(character.HeroObject);
						}
					}
					else if (countChange < 0)
					{
						if (!this.IsPrisonRoster)
						{
							this.OwnerParty.OnHeroRemoved(character.HeroObject);
						}
						else
						{
							this.OwnerParty.OnHeroRemovedAsPrisoner(character.HeroObject);
						}
					}
				}
				if (countChange != 0 || woundedCountChange != 0)
				{
					this.OnNumberChanged(countChange != 0, woundedCountChange != 0, heroCountChanged);
				}
			}
			catch (IndexOutOfRangeException)
			{
				string troops = "Empty";
				int len = this.data.GetLength(0);
				if (len > 0)
				{
					troops = "";
					for (int i = 0; i < len; i++)
					{
						troops += string.Format("[{0}] = {1}, ", i, this.data[i].ToString());
					}
				}
				InformationManager.DisplayMessage(new InformationMessage(string.Format("Caught IndexOutOfRangeException, index = {0}, countChange = {1}, TroopRoster = {2}", index, countChange, troops)));
			}
			return index;
		}
	}
}

9. Press Compile.

10. Go to File -> Save Module, make sure the Filename is
C:\Program Files (x86)\Steam\steamapps\common\Mount & Blade II Bannerlord\bin\Win64_Shipping_Client\TaleWorlds.CampaignSystem.dll

11. Press Ok.

11. Verify the dll is patched by looking Date Modified.

When the fix is triggered, it'll say something in the Combat Log (bottom left text thing) like:
Caught IndexOutOfRange Exception, index = -1, countChange = -1, TroopRoster = [0] = 9 Looter, [1] = 0, [2] = 0, [3] = 0,