#vulnerable code 
                              @Deprecated
  public static boolean removeHotkey(char key, int modifiers) {
    return HotkeyManager.getInstance().removeHotkey(key, modifiers);
  } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              @Deprecated
  public static boolean removeHotkey(char key, int modifiers) {
    return Key.removeHotkey(key, modifiers);
  }