I'm also having major crash issues related to Ambient Spawn. Log from one of the most recent crashes below:
[5/3/2019 4:40:18 PM.511] LSPD First Response: [TRACE] GetBackupTemplate for LocalPatrol in BlaineCounty in Zancudo using SpawnsAmbiently
[5/3/2019 4:40:18 PM.512] LSPD First Response: [TRACE] Preloading SHERIFF2
[5/3/2019 4:40:19 PM.227] LSPD First Response: [TRACE] Preloading MP_F_FREEMODE_01
[5/3/2019 4:40:19 PM.230] LSPD First Response: [TRACE] New ped created mp_f_freemode_01 (PedType: 6), Agency: CityPolice ()
[5/3/2019 4:40:19 PM.237] s_f_y_cop_01_white_full_01
[5/3/2019 4:40:19 PM.237] LSPD First Response: [TRACE] Voice: s_f_y_cop_01_white_full_01
[5/3/2019 4:40:19 PM.237] LSPD First Response: [TRACE] Set them as cop, original was: FADE4843
[5/3/2019 4:40:19 PM.238] LSPD First Response: [TRACE] Misty Sparks (MP_F_FREEMODE_01) was set as a cop
[5/3/2019 4:40:19 PM.238] LSPD First Response: [TRACE] Set movement animations for cop: MP_F_FREEMODE_01
[5/3/2019 4:40:19 PM.238] LSPD First Response: [TRACE] New ped creation finished, Gender: Female
[5/3/2019 4:40:19 PM.238] LSPD First Response: [TRACE] Preloading MP_F_FREEMODE_01
[5/3/2019 4:40:19 PM.241] LSPD First Response: [TRACE] New ped created mp_f_freemode_01 (PedType: 6), Agency: CityPolice ()
[5/3/2019 4:40:19 PM.245] s_f_y_cop_01_black_full_01
[5/3/2019 4:40:19 PM.245] LSPD First Response: [TRACE] Voice: s_f_y_cop_01_black_full_01
[5/3/2019 4:40:19 PM.245] LSPD First Response: [TRACE] Set them as cop, original was: FADE4843
[5/3/2019 4:40:19 PM.246] LSPD First Response: [TRACE] Kayla Lausanne (MP_F_FREEMODE_01) was set as a cop
[5/3/2019 4:40:19 PM.246] LSPD First Response: [TRACE] Set movement animations for cop: MP_F_FREEMODE_01
[5/3/2019 4:40:19 PM.246] LSPD First Response: [TRACE] New ped creation finished, Gender: Female
[5/3/2019 4:40:19 PM.247] LSPD First Response: [TRACE] AmbientSpawn - spawned: sheriff2
[5/3/2019 4:40:19 PM.582] LSPD First Response: [TRACE] PoolWatcher: Found new ped and set them as cop: null
[5/3/2019 4:40:19 PM.582] LSPD First Response: [TRACE] PoolWatcher: Found new ped and set them as cop: null
[5/3/2019 4:40:30 PM.629] LSPD First Response: [TRACE] Added stopped ped: A_M_M_SALTON_01
[5/3/2019 4:40:30 PM.803] LSPD First Response: [TRACE] Added stopped ped: A_M_M_SALTON_01
[5/3/2019 4:40:35 PM.831] LSPD First Response: [TRACE] Added stopped ped: A_F_M_TOURIST_01
[5/3/2019 4:40:35 PM.832] LSPD First Response: [TRACE] Added stopped ped: A_M_M_SALTON_01
[5/3/2019 4:40:35 PM.986] LSPD First Response: [TRACE] Added stopped ped: A_F_M_TOURIST_01
[5/3/2019 4:40:35 PM.987] LSPD First Response: [TRACE] Added stopped ped: A_M_M_SALTON_01
[5/3/2019 4:40:43 PM.603] LSPD First Response: [TRACE] GetBackupTemplate for LocalPatrol in BlaineCounty in Zancudo using SpawnsAmbiently
[5/3/2019 4:40:43 PM.606] LSPD First Response: [TRACE] Preloading SHERIFF
[5/3/2019 4:40:44 PM.344] LSPD First Response:
[5/3/2019 4:40:44 PM.344] LSPD First Response: ==============================
[5/3/2019 4:40:44 PM.344] LSPD First Response: UNHANDLED EXCEPTION DURING GAME FIBER TICK
[5/3/2019 4:40:44 PM.344] LSPD First Response: ------------------------------
[5/3/2019 4:40:44 PM.344] LSPD First Response: Origin: Game fiber "AmbientSpawn".
[5/3/2019 4:40:44 PM.344] LSPD First Response: ------------------------------
[5/3/2019 4:40:44 PM.344] LSPD First Response: Exception type: System.InvalidOperationException
[5/3/2019 4:40:44 PM.344] LSPD First Response: Exception message: Could not spawn new vehicle.
[5/3/2019 4:40:44 PM.344] LSPD First Response: ------------------------------
[5/3/2019 4:40:44 PM.344] LSPD First Response: Inner exceptions:
[5/3/2019 4:40:44 PM.344] LSPD First Response: ------------------------------
[5/3/2019 4:40:44 PM.344] LSPD First Response: Stack trace:
[5/3/2019 4:40:44 PM.345] LSPD First Response: at Rage.Vehicle.HandleVehicleCreation(Model model, Vector3 position, Single heading)
[5/3/2019 4:40:44 PM.345] at Rage.Vehicle..ctor(Model model, Vector3 position, Single heading)
[5/3/2019 4:40:44 PM.345] at .(Model , , VehicleBackupType , Vector3 , Single , Int32 , Boolean , Boolean ) in E:\GTA V\LSPD First Response\LSPD First Response\Mod\Ambient\AmbientSpawn.cs:line 155
[5/3/2019 4:40:44 PM.345] at .() in E:\GTA V\LSPD First Response\LSPD First Response\Mod\Ambient\AmbientSpawn.cs:line 147
[5/3/2019 4:40:44 PM.345] at .() in E:\GTA V\LSPD First Response\LSPD First Response\Mod\Ambient\AmbientSpawn.cs:line 94
[5/3/2019 4:40:44 PM.345] at .() in E:\GTA V\LSPD First Response\LSPD First Response\Mod\Ambient\AmbientSpawn.cs:line 83
[5/3/2019 4:40:44 PM.345] at .() in E:\GTA V\LSPD First Response\LSPD First Response\Mod\Ambient\AmbientSpawn.cs:line 50
[5/3/2019 4:40:44 PM.345] at .() in E:\GTA V\LSPD First Response\LSPD First Response\Engine\Scripting\ThreadedScriptComponent.cs:line 66
[5/3/2019 4:40:44 PM.345] at Rage.GameFiber.Main()
[5/3/2019 4:40:44 PM.345] LSPD First Response: ==============================
[5/3/2019 4:40:44 PM.345] LSPD First Response:
[5/3/2019 4:40:44 PM.354] LSPD First Response: [FATAL] Forced termination
[5/3/2019 4:40:44 PM.355] LSPD First Response: [TRACE] Released 0 entities from DefaultContentManager
[5/3/2019 4:40:46 PM.025] LSPD First Response: [INFO] LSPDFR has shut down
[5/3/2019 4:40:46 PM.983] LSPD First Response: ==============================
[5/3/2019 4:40:47 PM.005] LSPD First Response: ==============================
[5/3/2019 4:40:47 PM.123] LSPD First Response: All signs removed