Fix command and get

src/main/java/com/volmit/iris/command/CommandIrisStudioOpen.java

@@ -24,9 +24,10 @@ public class CommandIrisStudioOpen extends MortarCommand
 			return true;
 		}
 		
-		if(args.length != 1)
+		if(args.length < 1)
 		{
 			sender.sendMessage("/iris std open <DIMENSION> (file name without .json)");
+			return true;
 		}
 
 		Iris.proj.open(sender, args[0]);

src/main/java/com/volmit/iris/gen/atomics/AtomicSliver.java

@@ -87,7 +87,7 @@ public class AtomicSliver
 		{
 			return null;
 		}
-		FastBlockData b = block[h];
+		FastBlockData b = block[h < 256 ? h : 256];
 		last = M.ms();
 
 		if(b == null)