output: #fixed code
                                  public ClassPrototype generate(Class<?> type) {
          Module module = ModuleRegistry.getDefault().getOrCreate(type.getPackage().getName());
          ClassPrototype prototype = module.get(type.getSimpleName());
  
          if (prototype != null) {
              return prototype;
          }
  
          prototype = new ClassPrototype(module, type.getSimpleName());
          prototype.getAssociated().add(type);
  
          for (Field field : type.getFields()) {
              ClassPrototypeFieldGenerator generator = new ClassPrototypeFieldGenerator(type, prototype, field);
              PrototypeField prototypeField = generator.generate();
              prototype.getFields().add(prototypeField);
          }
  
          for (Constructor<?> constructor : type.getConstructors()) {
              ClassPrototypeConstructorGenerator generator = new ClassPrototypeConstructorGenerator(type, prototype, constructor);
              PrototypeConstructor prototypeField = generator.generate();
              prototype.getConstructors().add(prototypeField);
          }
  
          for (Method method : type.getMethods()) {
              switch (method.getName()) {
                  case "finalize":
                  case "notify":
                  case "notifyAll":
                  case "wait":
                      continue;
              }
  
              ClassPrototypeMethodGenerator generator = new ClassPrototypeMethodGenerator(type, prototype, method);
              PrototypeMethod prototypeMethod = generator.generate();
              prototype.getMethods().registerMethod(prototypeMethod);
          }
  
          return prototype;
      }
input: #vulnerable code 
                                  public ClassPrototype generate(Class<?> type) {
          Module module = ModuleRegistry.getDefault().getOrCreate(type.getPackage().getName());
  
          ClassPrototype prototype = new ClassPrototype(module, type.getSimpleName());
          prototype.getAssociated().add(type);
  
          for (Field field : type.getFields()) {
              ClassPrototypeFieldGenerator generator = new ClassPrototypeFieldGenerator(type, prototype, field);
              PrototypeField prototypeField = generator.generate();
              prototype.getFields().add(prototypeField);
          }
  
          for (Constructor<?> constructor : type.getConstructors()) {
              ClassPrototypeConstructorGenerator generator = new ClassPrototypeConstructorGenerator(type, prototype, constructor);
              PrototypeConstructor prototypeField = generator.generate();
              prototype.getConstructors().add(prototypeField);
          }
  
          for (Method method : type.getMethods()) {
              ClassPrototypeMethodGenerator generator = new ClassPrototypeMethodGenerator(type, prototype, method);
              PrototypeMethod prototypeMethod = generator.generate();
              prototype.getMethods().registerMethod(prototypeMethod);
          }
  
          return prototype;
      } 
                              #location 22 
                              #vulnerability type NULL_DEREFERENCE