cargo under map

cargo is spawning under the map

tried reloading and got this spamming consolle
NullReferenceException
  at (wrapper managed-to-native) UnityEngine.Component.get_transform(UnityEngine.Component)
  at BasePathNode.IsValid () [0x00000] in <6a0cddd1b3834d348f4fc9ac7883d503>:0 
  at BaseNavigator.GetNextPathPosition () [0x00025] in <6a0cddd1b3834d348f4fc9ac7883d503>:0 
  at BaseNavigator.UpdateMovement (System.Single delta) [0x000b5] in <6a0cddd1b3834d348f4fc9ac7883d503>:0 
  at BaseNavigator.UpdateNavigation (System.Single delta) [0x00000] in <6a0cddd1b3834d348f4fc9ac7883d503>:0 
  at BaseNavigator.Think (System.Single delta) [0x0001f] in <6a0cddd1b3834d348f4fc9ac7883d503>:0 
  at BaseAIBrain.DoMovementTick () [0x0002c] in <6a0cddd1b3834d348f4fc9ac7883d503>:0 
  at BaseAIBrain.TickMovement () [0x00069] in <6a0cddd1b3834d348f4fc9ac7883d503>:0 
  at InvokeHandlerBase`1[T].DoTick () [0x00138] in <05bc115bb13446a4a5a9726e7cadc8a1>:0 
  at InvokeHandlerBase`1[T].LateUpdate () [0x0000c] in <05bc115bb13446a4a5a9726e7cadc8a1>:0 

also spawned npcs under the map and everywhere around the area. 

i had to kill the npcs to stop the spamming.