[Bug 1707491] systemsettings5 crashed with SIGSEGV in QQmlPropertyCache::resolve()

[Apport retracing service]

StacktraceTop:
 QQmlPropertyCache::resolve (this=this at entry=0x555f6dbf2f50, data=data at entry=0x555f6dbf5580) at qml/qqmlpropertycache.cpp:741
 ensureResolved (p=0x555f6dbf5580, this=0x555f6dbf2f50) at qml/qqmlpropertycache_p.h:505
 QQmlPropertyCache::findProperty (this=0x555f6dbf2f50, it=..., vmemo=<optimized out>, context=<optimized out>) at qml/qqmlpropertycache.cpp:920
 property<QV4::String*> (context=0x555f6dc495e0, object=0x7fa2d42f0fa0 <Units::instance()::units>, key=<synthetic pointer>, this=<optimized out>) at ../../include/QtQml/5.7.1/QtQml/private/../../../../../src/qml/qml/qqmlpropertycache_p.h:288
 QV4::QObjectWrapper::findProperty (this=this at entry=0x7fa2ccda23e0, engine=engine at entry=0x555f6db34230, qmlContext=qmlContext at entry=0x555f6dc495e0, name=name at entry=0x7fa2ccda23d8, revisionMode=revisionMode at entry=QV4::QObjectWrapper::IgnoreRevision, local=local at entry=0x7ffc03f8c430) at jsruntime/qv4qobjectwrapper.cpp:257

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Title:
  systemsettings5 crashed with SIGSEGV in QQmlPropertyCache::resolve()

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