Exclude not include noId npc's.

src/engine/objects/Mob.java

@@ -808,7 +808,7 @@ public class Mob extends AbstractIntelligenceAgent {
         // otherwise use the mob cache location.
 
         if (this.building != null && building.getBlueprintUUID() != 0
-            && this.loadID == 0) {
+            && this.loadID != 0) {
 
             int maxSlots = 10;
 

src/engine/objects/NPC.java

@@ -357,7 +357,7 @@ public class NPC extends AbstractCharacter {
 		// createMobWithNoID() is called.
 
 		if (this.building != null &&
-		    this.loadID == 0) {
+		    this.loadID != 0) {
 
 			// Artillery Tower Captains use a hardcoded slot not first available