output: #fixed code
                                  public ItemList getDataItemList() throws RiotApiException {
  
          return StaticDataMethod.getDataItemList(getRegion(), getKey(), null, null, (ItemListData) null);
      }
input: #vulnerable code 
                                  public ItemList getDataItemList() throws RiotApiException {
  
          return StaticDataMethod.getDataItemList(getRegion(), getKey(), null, null, null);
      } 
                              #location 3 
                              #vulnerability type NULL_DEREFERENCE