PVS-Studio warning V522 for Chromium

bool ChromeFrameNPAPI::Invoke(....)
{
  ChromeFrameNPAPI* plugin_instance =
    ChromeFrameInstanceFromNPObject(header);
  if (!plugin_instance &&
      (plugin_instance->automation_client_.get()))
    return false;
  ...
}

This suspicious code was found in Chromium project by PVS-Studio static code analyzer.
Warning message is:
V522 Dereferencing of the null pointer 'plugin_instance' might take place. Check the logical condition.  chrome_frame_npapi  chrome_frame_npapi.cc  517

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/