diff --git a/src/engine/InterestManagement/Terrain.java b/src/engine/InterestManagement/Terrain.java
index 403179b9..9fed2cd9 100644
--- a/src/engine/InterestManagement/Terrain.java
+++ b/src/engine/InterestManagement/Terrain.java
@@ -62,6 +62,9 @@ public class Terrain {
 
         Zone terrain_zone = zone;
 
+        if (zone == null)
+            return ZoneManager.getSeaFloor();
+
         if (zone.terrain != null)
             return zone;