Application crashes in the IEnumConnections->Next method after calling IConnectionPointContainer->Unadvise method

void crash4( IQTCrashPtr qtObject, TestSinkPtr sink )
{
	IConnectionPointPtr connectionPoint;
	IConnectionPointContainerPtr( qtObject )->FindConnectionPoint( __uuidof( IQTCrashEvents ), &connectionPoint );

	DWORD cookie1;
	connectionPoint->Advise( sink, &cookie1 ); // first connection

	DWORD cookie2;
	connectionPoint->Advise( sink, &cookie2 ); // second connection

	IEnumConnectionsPtr connections;
	connectionPoint->EnumConnections( &connections );
	connections->Reset(); // ->Next will crash without this

	connectionPoint->Unadvise( cookie1 ); // disconnect the first connection

	DWORD fetched;
	CONNECTDATA cd = { 0, 0 };
	while( connections->Next( 1, &cd, &fetched ) == S_OK ) // crash here
	{
	}
}