diff --git a/Plugins/Nautilus.Game.Arcade/src/nautilus/game/arcade/kit/perks/PerkCreeperExplode.java b/Plugins/Nautilus.Game.Arcade/src/nautilus/game/arcade/kit/perks/PerkCreeperExplode.java
index 0fe298495..6498ec8d8 100644
--- a/Plugins/Nautilus.Game.Arcade/src/nautilus/game/arcade/kit/perks/PerkCreeperExplode.java
+++ b/Plugins/Nautilus.Game.Arcade/src/nautilus/game/arcade/kit/perks/PerkCreeperExplode.java
@@ -147,9 +147,11 @@ public class PerkCreeperExplode extends SmashPerk
 				
 				//Blocks
 				Collection<Block> blocks = UtilBlock.getInRadius(player.getLocation(), 12).keySet();
-				for(Block bl : blocks)
-					if(bl.getType() == Material.STATIONARY_LAVA || bl.getType() == Material.LAVA || bl.getType() == Material.BEDROCK) blocks.remove(bl);
-				
+				synchronized(blocks)
+				{
+					for(Block bl : blocks)
+						if(bl.getType() == Material.STATIONARY_LAVA || bl.getType() == Material.LAVA || bl.getType() == Material.BEDROCK) blocks.remove(bl);
+				}
 				Manager.GetExplosion().BlockExplosion(blocks, player.getLocation(), false);
 				
 				//Remove Spawns