Error log added

src/engine/objects/Building.java

@@ -928,6 +928,9 @@ public class Building extends AbstractWorldObject {
 
             this.patrolPoints = BuildingManager._buildingPatrolPoints.computeIfAbsent(this.getObjectUUID(), k -> new ArrayList<>());
 
+            if (this.patrolPoints == null)
+                Logger.error("Null patrol points");
+
         } else {
             this.healthMax = 100000;  // Structures with no blueprint mesh
             this.setHealth(healthMax);