Updated to latest SongodaCore.

pom.xml

@@ -125,7 +125,7 @@
         <dependency>
             <groupId>com.songoda</groupId>
             <artifactId>SongodaCore</artifactId>
-            <version>LATEST</version>
+            <version>2.6.10</version>
             <scope>compile</scope>
         </dependency>
         <dependency>

src/main/java/com/songoda/ultimatestacker/UltimateStacker.java

@@ -367,12 +367,17 @@ public class UltimateStacker extends SongodaPlugin {
                 spawnerStackManager.removeSpawner(stack.getLocation());
         // are holograms enabled?
         if (!stack.areHologramsEnabled() && !HologramManager.getManager().isEnabled()) return;
-        // create the hologram
-        HologramManager.updateHologram(stack.getLocation(), stack.getHologramName());
+        // update the hologram
+        if (!HologramManager.isHologramLoaded(stack.getHologramId())) {
+            HologramManager.createHologram(stack.getHologramId(), stack.getLocation(), stack.getHologramName());
+            return;
+        }
+
+        HologramManager.updateHologram(stack.getHologramId(), stack.getHologramName());
     }
 
     public void removeHologram(Hologramable stack) {
-        HologramManager.removeHologram(stack.getLocation());
+        HologramManager.removeHologram(stack.getHologramId());
     }
 
     //////// Convenient API //////////

src/main/java/com/songoda/ultimatestacker/stackable/Hologramable.java

@@ -11,4 +11,6 @@ public interface Hologramable {
     boolean areHologramsEnabled();
 
     boolean isValid();
+
+    String getHologramId();
 }

src/main/java/com/songoda/ultimatestacker/stackable/block/BlockStack.java

@@ -10,8 +10,15 @@ import com.songoda.ultimatestacker.utils.Stackable;
 import org.bukkit.Location;
 import org.bukkit.World;
 
+import java.util.UUID;
+
 public class BlockStack implements Stackable, Hologramable {
 
+    // This is the unique identifier for this stack.
+    // It is reset on every plugin load.
+    // Used for holograms.
+    private final UUID uniqueId = UUID.randomUUID();
+
     // The id that identifies this stack in the database.
     private int id;
 
@@ -105,6 +112,11 @@ public class BlockStack implements Stackable, Hologramable {
         this.id = id;
     }
 
+    @Override
+    public String getHologramId() {
+        return "UltimateStacker-" + uniqueId;
+    }
+
     @Override
     public String toString() {
         return "BlockStack{" +

src/main/java/com/songoda/ultimatestacker/stackable/spawner/SpawnerStack.java

@@ -12,9 +12,15 @@ import org.bukkit.World;
 import org.bukkit.block.CreatureSpawner;
 
 import java.util.Random;
+import java.util.UUID;
 
 public class SpawnerStack extends SSpawner implements Stackable, Hologramable {
 
+    // This is the unique identifier for this spawner.
+    // It is reset on every plugin load.
+    // Used for holograms.
+    private final UUID uniqueId = UUID.randomUUID();
+    
     private int id;
 
     private int amount;
@@ -93,6 +99,11 @@ public class SpawnerStack extends SSpawner implements Stackable, Hologramable {
         return location.getWorld();
     }
 
+    @Override
+    public String getHologramId() {
+        return "UltimateStacker-" + uniqueId;
+    }
+
     @Override
     public String toString() {
         return "SpawnerStack:{"