#fixed code
                              @Override
  public String getIconFileName() {
    PluginWrapper wrapper = Jenkins.getInstanceOrNull().getPluginManager()
      .getPlugin(SonarPlugin.class);
    return "/plugin/" + wrapper.getShortName() + "/images/waves_48x48.png";
  }
#vulnerable code 
                              @Override
  public String getIconFileName() {
    PluginWrapper wrapper = Jenkins.getInstance().getPluginManager()
      .getPlugin(SonarPlugin.class);
    return "/plugin/" + wrapper.getShortName() + "/images/waves_48x48.png";
  } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE