Welcome to GTA5-Mods.com

@flodumalawi I checked the log and came across this problem.

[22:51:18] [ERROR] Caught fatal unhandled exception:
System.NullReferenceException: Object reference not set to an instance of an object.
at ZombiesMod.SurvivorTypes.HostileSurvivors.VehicleWrapperOnUpdated(EntityEventWrapper sender, Entity entity) in C:\Users\sxnor\Documents\Visual Studio 2015\Projects\ZombiesMod\ZombiesMod\SurvivorTypes\HostileSurvivors.cs:line 71
at ZombiesMod.Wrappers.EntityEventWrapper.OnTick(Object sender, EventArgs eventArgs) in C:\Users\sxnor\Documents\Visual Studio 2015\Projects\ZombiesMod\ZombiesMod\Wrappers\EntityEventWrapper.cs:line 52
at ZombiesMod.Scripts.ScriptEventHandler.UpdateWrappers(Object sender, EventArgs eventArgs) in C:\Users\sxnor\Documents\Visual Studio 2015\Projects\ZombiesMod\ZombiesMod\Scripts\ScriptEventHandler.cs:line 66
at ZombiesMod.Scripts.ScriptEventHandler.OnTick(Object sender, EventArgs eventArgs) in C:\Users\sxnor\Documents\Visual Studio 2015\Projects\ZombiesMod\ZombiesMod\Scripts\ScriptEventHandler.cs:line 46
at GTA.Script.raise_Tick(Object value0, EventArgs value1)
at GTA.Script.MainLoop()
That was the only thing i found that relates to the problem.

@flodumalawi No, I don't have any other mods installed. I did change the zombiesmod.ini to change the number of zombies, but it wasn't too significant. MinSpawnZombies: 10 and MaxSpawnedZombies 35. Do you think scaling those back to default would help? Those were the only two settings i altered.

So Ive searched almost all of the comments and couldn't find a concrete answer. Whenever i play, roughly about 45 minutes in the zombies tend to stay in place and not move. was wondering if anyone could help troubleshoot this problem. Thank you :)