QDBusConnection::callWithCallback() fails if reply slot takes more than one argument

My application receives these errors:

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QFATAL : SsoTestClient::queryAvailableMetods() QDBusPendingReply: type void is not registered with QtDBus
FAIL! : SsoTestClient::queryAvailableMetods() Received a fatal error.
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The code used to build fine in MeeGo / Harmattan, but now I'm testing some code on a 64bit machine; it may be that the issue is only reproducible on 64 bit environments.

Near the end of QDBusPendingCallPrivate::setReplyCallback() there's this:

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// QList<int> is actually a vector
// kids, don't try this at home
setMetaTypes(count, count ? &metaTypes.at(1) : 0);
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When debugging, I saw that metaTypes contained three values: 0, 206 and 9. But the array received by setMetaTypes was 206, 0, 9 (but the length is 2, so the last number would be ignored) – that is, an element with value 0 appears in between of the array elements, causing the error above.
I locally fixed the issue like this:

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@@ -180,9 +181,12 @@ bool QDBusPendingCallPrivate::setReplyCallback(QObject *target, const char *memb
if (metaTypes.at(count) == QDBusMetaTypeId::message)
--count;

• // QList<int> is actually a vector
• // kids, don't try this at home
• setMetaTypes(count, count ? &metaTypes.at(1) : 0);
  + if (count == 0) { + setMetaTypes(count, 0); + }

  else

  { + QVector<int> types = QVector<int>::fromList(metaTypes); + setMetaTypes(count, types.constData() + 1); + }

  return true;
  }
  =======

I'm going to propose the patch above for merging – but any hint on how to solve the problem from my application while the patch is not integrated into Qt will be greatly appreciated!