Game crash before battle, not sure what error is

The game crash before going into battle for some armies, not sure which mod is causing it. exception error as follow:

Please help, thanks!!

Exception information
Type: System.ArgumentNullException
Message: Value cannot be null. Parameter name: source
Source: System.Core
CallStack:

1. at System.Linq.Enumerable.Any[TSource](IEnumerable`1 source)
2. at TaleWorlds.Core.Extensions.IsEmpty[T](IEnumerable`1 source)
3. at SandBox.SandboxBattleBannerBearersModel.GetBannerBearerReplacementWeapon(BasicCharacterObject agentCharacter)
4. at TaleWorlds.MountAndBlade.Mission.SpawnTroop_Patch1(Mission this, IAgentOriginBase troopOrigin, Boolean isPlayerSide, Boolean hasFormation, Boolean spawnWithHorse, Boolean isReinforcement, Int32 formationTroopCount, Int32 formationTroopIndex, Boolean isAlarmed, Boolean wieldInitialWeapons, Boolean forceDismounted, Nullable`1 initialPosition, Nullable`1 initialDirection, String specialActionSetSuffix, ItemObject bannerItem, FormationClass formationIndex)
5. at TaleWorlds.MountAndBlade.BannerBearerLogic.FormationBannerController.UpdateBannerBearersForDeployment()
6. at TaleWorlds.MountAndBlade.AutoCaptainAssignmentLogic.OnCaptainAssignedToFormation(Agent captain, Formation formation)
7. at TaleWorlds.MountAndBlade.AutoCaptainAssignmentLogic.AssignBestCaptainsForTeam(Team team)
8. at TaleWorlds.MountAndBlade.AutoCaptainAssignmentLogic.OnFormationUnitsSpawned(Team team)
9. at TaleWorlds.MountAndBlade.Team.OnFormationUnitsSpawned()
10. at TaleWorlds.MountAndBlade.MissionAgentSpawnLogic.OnInitialSpawnForSideEnded(BattleSideEnum side)
11. at TaleWorlds.MountAndBlade.DeploymentMissionController.SetupTeams()
12. at TaleWorlds.MountAndBlade.DeploymentMissionController.OnMissionTick(Single dt)
13. at TaleWorlds.MountAndBlade.Mission.OnTick(Single dt, Single realDt, Boolean updateCamera, Boolean doAsyncAITick)
14. at TaleWorlds.MountAndBlade.MissionState.TickMission(Single realDt)
15. at TaleWorlds.MountAndBlade.MissionState.OnTick(Single realDt)
16. at TaleWorlds.Core.GameStateManager.OnTick(Single dt)
17. at TaleWorlds.Core.Game.OnTick(Single dt)
18. at TaleWorlds.Core.GameManagerBase.OnTick(Single dt)
19. at TaleWorlds.MountAndBlade.Module.OnApplicationTick_Patch1(Module this, Single dt)

submitted by /u/Cadors85
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