QSystemBatteryInfo crashes when the power adapter is plugged/unplugged

I have used the following code:
QCoreApplication a(argc, argv);

QSystemBatteryInfo *bi = new QSystemBatteryInfo();
qDebug() << "battery status: " << bi->remainingCapacityPercent() << "%";
return a.exec();

Start the application on a laptop, then, while the application is still running, plug or unplug the power adapter. The application crashes and the crash occurs in systeminfo\qsysteminfo_win.cpp:1744

#if !defined(Q_OS_WINCE)
bool qax_winEventFilter(void *message)
{
MSG pMsg = (MSG)message;
if( pMsg->message == WM_POWERBROADCAST) {

qDebug() << Q_FUNC_INFO;
POWERBROADCAST_SETTING* pps = (POWERBROADCAST_SETTING*) pMsg->lParam;
if ( sizeof(int) == pps->DataLength &&
pps->PowerSetting == GUID_BATTERY_PERCENTAGE_REMAINING ) {
int nPercentLeft = (int)(DWORD_PTR) pps->Data;

It seems that the event WM_POWERBROADCAST is send, but pMsg->lParam is NULL and the code does not handle this situation. Please see the attachment for a patch.