Hi, with the latest LuaMetaTeX upload (running on Linux x64), \normalunexpanded tries to write to address 0 and therefore segfaults: \normalunexpanded{abc} \starttext \stoptext ConTeXt fails with mtx-context | fatal error: return code: 139 The most interesting message from valgrind is ==53200== Invalid write of size 4 ==53200== at 0x17113D: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x151625: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x151E40: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x15E1A2: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x154AA1: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x122347: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x4A0C151: (below main) (in /usr/lib/libc-2.32.so) ==53200== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==53200== ==53200== ==53200== Process terminating with default action of signal 11 (SIGSEGV): dumping core ==53200== Access not within mapped region at address 0x0 ==53200== at 0x17113D: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x151625: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x151E40: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x15E1A2: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x154AA1: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x122347: ??? (in /home/marcel/lmtx-install/tex/texmf-linux-64/bin/luametatex) ==53200== by 0x4A0C151: (below main) (in /usr/lib/libc-2.32.so) ==53200== If you believe this happened as a result of a stack ==53200== overflow in your program's main thread (unlikely but ==53200== possible), you can try to increase the size of the ==53200== main thread stack using the --main-stacksize= flag. ==53200== The main thread stack size used in this run was 8388608. Best regards, Marcel