Undefined behavior in moc

/home/qtrob/dev/src/qt-dev_06.20-base_imageformats_svg/qtbase/src/corelib/text/qstring.cpp:508:16: runtime error: applying non-zero offset 16 to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/qtrob/dev/src/qt-dev_06.20-base_imageformats_svg/qtbase/src/corelib/text/qstring.cpp:508:16 in 
/home/qtrob/dev/src/qt-dev_06.20-base_imageformats_svg/qtbase/src/corelib/text/qstring.cpp:519:13: runtime error: applying non-zero offset 8 to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/qtrob/dev/src/qt-dev_06.20-base_imageformats_svg/qtbase/src/corelib/text/qstring.cpp:519:13 in

1  __pthread_kill_implementation                                                              pthread_kill.c 44   0x7e38baa969fc 
2  __pthread_kill_internal                                                                    pthread_kill.c 78   0x7e38baa969fc 
3  __GI___pthread_kill                                                                        pthread_kill.c 89   0x7e38baa969fc 
4  __GI_raise                                                                                 raise.c        26   0x7e38baa42476 
5  __GI_abort                                                                                 abort.c        79   0x7e38baa287f3 
6  qAbort                                                                                     qassert.cpp    49   0x55c599cd3f7d 
7  qt_message_fatal<QString&>                                                                 qlogging.cpp   2112 0x55c599cd5178 
8  qt_message                                                                                 qlogging.cpp   380  0x55c599cd41f4 
9  QMessageLogger::fatal                                                                      qlogging.cpp   880  0x55c599cd46b6 
10 qt_assert                                                                                  qassert.cpp    105  0x55c599cd3fce 
11 simdTestMask                                                                               qstring.cpp    435  0x55c599d2e6ea 
12 isAscii_helper                                                                             qstring.cpp    867  0x55c599d2e5e2 
13 QtPrivate::isAscii                                                                         qstring.cpp    886  0x55c599d2e53c 
14 QCborContainerPrivate::append                                                              qcborvalue_p.h 247  0x55c599d82f8a 
15 QCborValue::QCborValue                                                                     qcborvalue.cpp 1954 0x55c599d82f06 
16 QCborValue::QCborValue                                                                     qcborvalue.cpp 1943 0x55c599d82e7e 
17 QJsonValue::QJsonValue                                                                     qjsonvalue.cpp 188  0x55c599d10511 
18 FunctionDef::toJson                                                                        moc.cpp        2091 0x55c599c972fa 
19 ClassDef::toJson() const::$_6::operator()(QString const&, QList<FunctionDef> const&) const moc.cpp        2022 0x55c599c95fce 
20 ClassDef::toJson                                                                           moc.cpp        2030 0x55c599c91f47 
21 Moc::generate                                                                              moc.cpp        1224 0x55c599c90bfb 
22 runMoc                                                                                     main.cpp       578  0x55c599c6bbed 
23 main                                                                                       main.cpp       652  0x55c599c6ecc6