qdoc: Segmentation fault when generating .qhp

Thread 1 "qdoc" received signal SIGSEGV, Segmentation fault.
0x00000000004c6e46 in QArrayDataPointer<char16_t>::QArrayDataPointer (this=0x7fffffffd420, other=...) at /data/snapshot-qt6-dev/qt5/qtbase/src/corelib/tools/qarraydatapointer.h:38
38              : d(other.d), ptr(other.ptr), size(other.size)
(gdb) bt
#0  0x00000000004c6e46 in QArrayDataPointer<char16_t>::QArrayDataPointer (this=0x7fffffffd420, other=...) at /data/snapshot-qt6-dev/qt5/qtbase/src/corelib/tools/qarraydatapointer.h:38
#1  0x00000000004c4e4d in QString::QString (this=0x7fffffffd420, other=...) at /data/snapshot-qt6-dev/qt5/qtbase/src/corelib/text/qstring.h:1324
#2  0x000000000064aca3 in HelpProjectWriter::writeNode (this=0x4c483d0, project=..., writer=..., node=0x0)
    at /data/snapshot-qt6-dev/qt5/qttools/src/qdoc/qdoc/src/qdoc/helpprojectwriter.cpp:492
#3  0x000000000064cbec in HelpProjectWriter::generateProject (this=0x4c483d0, project=...) at /data/snapshot-qt6-dev/qt5/qttools/src/qdoc/qdoc/src/qdoc/helpprojectwriter.cpp:680
#4  0x000000000064a578 in HelpProjectWriter::generate (this=0x4c483d0) at /data/snapshot-qt6-dev/qt5/qttools/src/qdoc/qdoc/src/qdoc/helpprojectwriter.cpp:450
#5  0x000000000066d464 in HtmlGenerator::generateDocs (this=0x7fffffffe030) at /data/snapshot-qt6-dev/qt5/qttools/src/qdoc/qdoc/src/qdoc/htmlgenerator.cpp:252
#6  0x00000000006a46df in processQdocconfFile (fileName=...) at /data/snapshot-qt6-dev/qt5/qttools/src/qdoc/qdoc/src/qdoc/main.cpp:602
#7  0x00000000006a4b96 in clearModuleDependenciesAndProcessQdocconfFile (qdocFiles=...) at /data/snapshot-qt6-dev/qt5/qttools/src/qdoc/qdoc/src/qdoc/main.cpp:638
#8  0x00000000006a4cf2 in dualExecutionMode () at /data/snapshot-qt6-dev/qt5/qttools/src/qdoc/qdoc/src/qdoc/main.cpp:672
#9  0x00000000006a4e95 in main (argc=10, argv=0x7fffffffe9a8) at /data/snapshot-qt6-dev/qt5/qttools/src/qdoc/qdoc/src/qdoc/main.cpp:718