qcssparser.cpp ASSERT: "d->parsed.metaType() == QMetaType::fromType<QList<QVariant>>()"

void Declaration::brushValues(QBrush *c, const QPalette &pal) const
{
    int needParse = 0x1f; // bits 0..3 say if we should parse the corresponding value.
                          // the bit 4 say we need to update d->parsed
    int i = 0;
    if (d->parsed.isValid()) {
        needParse = 0;
        Q_ASSERT(d->parsed.metaType() == QMetaType::fromType<QList<QVariant>>());   

#7  0x00007ffff5313f25 in QMessageLogger::fatal (this=0x7fffffffc400, msg=0x7ffff58e2810 "ASSERT: \"%s\" in file %s, line %d") at qtbase-dev/src/corelib/global/qlogging.cpp:880
#8  0x00007ffff5302f9c in qt_assert (assertion=0x7ffff69bb010 "d->parsed.metaType() == QMetaType::fromType<QList<QVariant>>()", file=0x7ffff69bab30 "qtbase-dev/src/gui/text/qcssparser.cpp", line=1533) at qtbase-dev/src/corelib/global/qassert.cpp:105
#9  0x00007ffff6711ebb in QCss::Declaration::brushValues (this=0x52e140, c=0x7fffffffc710, pal=...) at qtbase-dev/src/gui/text/qcssparser.cpp:1533
#10 0x00007ffff670c589 in QCss::ValueExtractor::extractBorder (this=0x7fffffffc6a0, borders=0x7fffffffc5a0, colors=0x7fffffffc710, styles=0x7fffffffc590, radii=0x7fffffffc5b0) at qtbase-dev/src/gui/text/qcssparser.cpp:614
#11 0x00007ffff64e9270 in operator() (__closure=0x7fffffffc648, borderWidth=0x7fffffffc6f0, borderBrush=0x7fffffffc710, borderStyles=0x7fffffffc6e0) at qtbase-dev/src/gui/text/qtexthtmlparser.cpp:1196
#12 0x00007ffff64e96f2 in QTextHtmlParserNode::applyCssDeclarations (this=0x663290, declarations=QList<QCss::Declaration> (size = 4) = {...}, resourceProvider=0x4af410) at qtbase-dev/src/gui/text/qtexthtmlparser.cpp:1231
#13 0x00007ffff64e6fd5 in QTextHtmlParser::parseTag (this=0x7fffffffc9f0) at qtbase-dev/src/gui/text/qtexthtmlparser.cpp:676
#14 0x00007ffff64e699e in QTextHtmlParser::parse (this=0x7fffffffc9f0) at qtbase-dev/src/gui/text/qtexthtmlparser.cpp:606
#15 0x00007ffff64e66c0 in QTextHtmlParser::parse (this=0x7fffffffc9f0, text="...", _resourceProvider=0x4af410) at qtbase-dev/src/gui/text/qtexthtmlparser.cpp:549