diff --git a/src/main/java/com/garbagemule/MobArena/commands/setup/ClassChestCommand.java b/src/main/java/com/garbagemule/MobArena/commands/setup/ClassChestCommand.java
index 4e1a9e5..6743690 100644
--- a/src/main/java/com/garbagemule/MobArena/commands/setup/ClassChestCommand.java
+++ b/src/main/java/com/garbagemule/MobArena/commands/setup/ClassChestCommand.java
@@ -7,13 +7,12 @@ import com.garbagemule.MobArena.commands.Command;
 import com.garbagemule.MobArena.commands.CommandInfo;
 import com.garbagemule.MobArena.commands.Commands;
 import com.garbagemule.MobArena.framework.ArenaMaster;
-import com.garbagemule.MobArena.util.config.ConfigUtils;
 import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 
-import java.util.HashSet;
+import java.util.Set;
 
 import static com.garbagemule.MobArena.util.config.ConfigUtils.setLocation;
 
@@ -42,7 +41,7 @@ public class ClassChestCommand implements Command {
         }
 
         Player p = (Player) sender;
-        Block b = p.getTargetBlock(new HashSet<Material>(), 10);
+        Block b = p.getTargetBlock((Set<Material>) null, 10);
 
         switch (b.getType()) {
             case CHEST: