PVS-Studio warning V625 for Synergy

CServer::~CServer()
{
  ....
  for (COldClients::iterator index = m_oldClients.begin();
       index != m_oldClients.begin(); ++index) {
  ....
}

This suspicious code was found in Synergy project by PVS-Studio static code analyzer.
Warning message is:
V625 Consider inspecting the 'for' operator. Initial and final values of the iterator are the same. cserver.cpp 233

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/