Fix CCE in SubCommand.invoke

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

@@ -26,6 +26,7 @@ import java.lang.reflect.Method;
 import java.lang.reflect.Parameter;
 import java.util.*;
 import java.util.function.Function;
+import java.util.function.Predicate;
 
 class SubCommand {
 
@@ -33,6 +34,7 @@ class SubCommand {
     private Method method;
     String[] subCommand;
     TypeMapper<?>[] arguments;
+    private Predicate<CommandSender> commandSenderPredicate;
     private Function<CommandSender, ?> commandSenderFunction;
     Class<?> varArgType = null;
 
@@ -45,6 +47,7 @@ class SubCommand {
         this.method = method;
 
         Parameter[] parameters = method.getParameters();
+        commandSenderPredicate = sender -> parameters[0].getType().isAssignableFrom(sender.getClass());
         commandSenderFunction = sender -> parameters[0].getType().cast(sender);
         this.subCommand = subCommand;
 
@@ -88,6 +91,9 @@ class SubCommand {
             return false;
         }
         try {
+            if (!commandSenderPredicate.test(commandSender)) {
+                return false;
+            }
             Object[] objects = SWCommandUtils.generateArgumentArray(commandSender, arguments, args, varArgType, subCommand);
             objects[0] = commandSenderFunction.apply(commandSender);
             method.setAccessible(true);