I have discovered a reproducible crash in LSPDFR itself that occurs when asking a ped for ID, where that ped has had their Persona replaced using the API.

 

[6/10/2019 7:18:34 PM.180] LSPD First Response: ==============================
[6/10/2019 7:18:34 PM.180] LSPD First Response: UNHANDLED EXCEPTION DURING GAME FIBER TICK
[6/10/2019 7:18:34 PM.181] LSPD First Response: ------------------------------
[6/10/2019 7:18:34 PM.181] LSPD First Response: Origin: Game fiber "<UNNAMED THREAD>".
[6/10/2019 7:18:34 PM.182] LSPD First Response: ------------------------------
[6/10/2019 7:18:34 PM.183] LSPD First Response: Exception type: System.NullReferenceException
[6/10/2019 7:18:34 PM.184] LSPD First Response: Exception message: Object reference not set to an instance of an object.
[6/10/2019 7:18:34 PM.184] LSPD First Response: ------------------------------
[6/10/2019 7:18:34 PM.185] LSPD First Response: Inner exceptions:
[6/10/2019 7:18:34 PM.185] LSPD First Response: ------------------------------
[6/10/2019 7:18:34 PM.186] LSPD First Response: Stack trace:
[6/10/2019 7:18:34 PM.187] LSPD First Response: at LSPD_First_Response.Engine.Scripting.Entities.Persona.CreatePed(Persona persona, Vector3 position) in E:\GTA V\LSPD First Response\LSPD First Response\Engine\Scripting\Entities\Persona.cs:line 447
[6/10/2019 7:18:34 PM.187] at ............................................................................................................................GetPedHeadshotTxd(Persona persona, Boolean bigHeadshot, Boolean noObscuredFace) in E:\GTA V\LSPD First Response\LSPD First Response\Engine\Scripting\Functions.cs:line 2095
[6/10/2019 7:18:34 PM.189] at .......................................................................................................................................................................................................................................................() in E:\GTA V\LSPD First Response\LSPD First Response\Mod\PedInteraction.cs:line 126
[6/10/2019 7:18:34 PM.190] at .......................................................................................................................................................................................................................................................() in E:\GTA V\LSPD First Response\LSPD First Response\Mod\PedInteraction.cs:line 108
[6/10/2019 7:18:34 PM.190] at .......................................................................................................................................................................................................................................................(........................................................................................................................... ) in E:\GTA V\LSPD First Response\LSPD First Response\Engine\Scripting\ThreadedScriptComponent.cs:line 86
[6/10/2019 7:18:34 PM.191] at .......................................................................................................................................................................................................................................................() in E:\GTA V\LSPD First Response\LSPD First Response\Engine\RecurringTask.cs:line 48
[6/10/2019 7:18:34 PM.192] at .......................................................................................................................................................................................................................................................() in E:\GTA V\LSPD First Response\LSPD First Response\Engine\Main.cs:line 54
[6/10/2019 7:18:34 PM.192] at .......................................................................................................................................................................................................................................................() in E:\GTA V\LSPD First Response\LSPD First Response\Mod\LSPDFR.cs:line 741
[6/10/2019 7:18:34 PM.193] at Rage.GameFiber.Main()
[6/10/2019 7:18:34 PM.193] LSPD First Response: ==============================

Proof of concept (in context of a PoC callout plugin😞

                ped = new Ped();
                ped.SetPositionWithSnap(Game.LocalPlayer.Character.GetOffsetPositionFront(3.0f));

                Persona newPersona = new Persona("Testy", "McTestFace", LSPD_First_Response.Gender.Male);
                Functions.SetPersonaForPed(ped, newPersona);

                Game.DisplaySubtitle("Now cause the ped to be Stopped by Player by holding 'E' and ask for ID.");

I've also built the DLL in case it's easier to throw this in plugins\LSPDFR, go on duty and reproduce the crash.

Reproduced and passed along in the testing forum. 

Thanks for the report. The issue is the specific constructor used which does not accept a model for the persona. This model is then later necessary for certain ped specific features. I don't think removing the constructor would be good as it might break quite a few mods, so I will update the internal model reference once you assign the persona to a ped.