SpigotCore_Main/src/de/steamwar/command/Argument.java

@@ -94,7 +94,7 @@ public class Argument<T> {
 
         public ArgumentBuilder(int min, int max, Argument<?>... arguments) {
             if (min < 0) min = 0;
-            if (max >= arguments.length) max = arguments.length - 1;
+            if (max > arguments.length) max = arguments.length;
             for (int i = min; i <= max; i++) {
                 generate(arguments, i, 0, new Argument[i]);
             }