PVS-Studio warning V599 for TortoiseGIT

class Command
{
  virtual bool Execute() = 0;
  ....
};

class SVNIgnoreCommand : public Command ....
class AddCommand : public Command ....
class AutoTextTestCommand : public Command ....

BOOL CTortoiseProcApp::InitInstance()
{
  ....
  Command * cmd = server.GetCommand(....);
  ....
  delete cmd;
  ....
}

This suspicious code was found in TortoiseGIT project by PVS-Studio static code analyzer.
Warning message is:
V599 The virtual destructor is not present, although the 'Command' class contains virtual functions. TortoiseGitProc tortoiseproc.cpp 497

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/