QmlCacheGen crashes on QML-file, but won't disclose where/why it cashes

#0  0x00007ffff7d5b540 in QQmlJSScope::accessSemantics (this=0x0)                                                                                                                                                    
    at /home/user/vcpkg-clone/buildtrees/qtdeclarative/x64-linux-dynamic-dbg/include/QtQmlCompiler/6.5.3/QtQmlCompiler/private/../../../../../../src/here-src-6-916c66c7af.clean/src/qmlcompiler/qqmljsscope_p.h:567 
#1  0x00007ffff7d56cd8 in QQmlJSCodeGenerator::conversion (this=0x7fffffffb880, from=..., to=..., variable=...)                                                                                                      
    at /home/user/vcpkg-clone/buildtrees/qtdeclarative/src/here-src-6-916c66c7af.clean/src/qmlcompiler/qqmljscodegenerator.cpp:2958                                                                                  
#2  0x00007ffff7d38a41 in QQmlJSCodeGenerator::generate_MoveConst (this=0x7fffffffb880, constIndex=6, destTemp=7)                                                                                                    
    at /home/user/vcpkg-clone/buildtrees/qtdeclarative/src/here-src-6-916c66c7af.clean/src/qmlcompiler/qqmljscodegenerator.cpp:452                                                                                   
#3  0x00007ffff749cc62 in QV4::Moth::ByteCodeHandler::decode (this=0x7fffffffb880, code=0x5555562bfff3 "\022r\030\b\022h\030\t\022s\030\n\350\004\a\030\006\002", len=21)                                            
    at /home/user/vcpkg-clone/buildtrees/qtdeclarative/src/here-src-6-916c66c7af.clean/src/qml/compiler/qv4bytecodehandler.cpp:41                                                                                    
#4  0x00007ffff7d351a3 in QQmlJSCodeGenerator::run (this=0x7fffffffb880, function=0x7fffffffc3d0, annotations=0x7fffffffbe20, error=0x7fffffffc4a0)                                                                  
    at /home/user/vcpkg-clone/buildtrees/qtdeclarative/src/here-src-6-916c66c7af.clean/src/qmlcompiler/qqmljscodegenerator.cpp:142                                                                                   
#5  0x00007ffff7d74d3c in QQmlJSAotCompiler::doCompile (this=0x7fffffffdab0, context=0x5555556c0850, function=0x7fffffffc3d0, error=0x7fffffffc4a0)
    at /home/user/vcpkg-clone/buildtrees/qtdeclarative/src/here-src-6-916c66c7af.clean/src/qmlcompiler/qqmljscompiler.cpp:798
#6  0x00007ffff7d7410f in QQmlJSAotCompiler::compileBinding (this=0x7fffffffdab0, context=0x5555556c0850, irBinding=..., astNode=0x5555555dd1c8)      
    at /home/user/vcpkg-clone/buildtrees/qtdeclarative/src/here-src-6-916c66c7af.clean/src/qmlcompiler/qqmljscompiler.cpp:707
#7  0x00007ffff7d70b17 in operator() (__closure=0x7fffffffcaa0, bindingOrFunction=...) at /home/user/vcpkg-clone/buildtrees/qtdeclarative/src/here-src-6-916c66c7af.clean/src/qmlcompiler/qqmljscompiler.cpp:327
#8  0x00007ffff7d74ef7 in std::for_each<__gnu_cxx::__normal_iterator<BindingOrFunction*, std::vector<BindingOrFunction> >, qCompileQmlFile(QmlIR::Document&, const QString&, QQmlJSSaveFunction, QQmlJSAotCompiler*, 
QQmlJSCompileError*, bool, QV4::Compiler::CodegenWarningInterface*, const QString*)::<lambda(const BindingOrFunction&)> >(__gnu_cxx::__normal_iterator<BindingOrFunction*, std::vector<BindingOrFunction, std::alloca
tor<BindingOrFunction> > >, __gnu_cxx::__normal_iterator<BindingOrFunction*, std::vector<BindingOrFunction, std::allocator<BindingOrFunction> > >, struct {...}) (__first=..., __last=..., __f=...)
    at /usr/include/c++/10/bits/stl_algo.h:3839                                                                                                                                                                      
#9  0x00007ffff7d71a4c in qCompileQmlFile(QmlIR::Document&, QString const&, std::function<bool (QV4::CompiledData::SaveableUnitPointer const&, QMap<int, QQmlJSAotFunction> const&, QString*)>, QQmlJSAotCompiler*, Q
QmlJSCompileError*, bool, QV4::Compiler::CodegenWarningInterface*, QString const*) (irDocument=..., inputFileName=..., saveFunction=..., aotCompiler=0x7fffffffdab0, error=0x7fffffffd710, 
    storeSourceLocation=true, interface=0x555555567a38 <QV4::Compiler::defaultCodegenWarningInterface()::iface>, fileContents=0x0)
    at /home/user/vcpkg-clone/buildtrees/qtdeclarative/src/here-src-6-916c66c7af.clean/src/qmlcompiler/qqmljscompiler.cpp:351