src/de/steamwar/bungeecore/commands/WhoisCommand.java

@@ -68,7 +68,7 @@ public class WhoisCommand extends SWCommand {
         if (user == null) {
             Message.send("UNKNOWN_PLAYER", player);
         } else {
-            EnumSet<WhoisParameterTypes> set = EnumSet.copyOf(Arrays.asList(parameters));
+            EnumSet<WhoisParameterTypes> set = parameters.length == 0 ? EnumSet.noneOf(WhoisParameterTypes.class) : EnumSet.copyOf(Arrays.asList(parameters));
             sendUserinfo(player, user, set);
         }
     }