Thread 1 "main" received signal SIGSEGV, Segmentation fault.
0x000055555576a400 in JS::Value::toObject (this=0x2ea6c5981548)
--Type <RET> for more, q to quit, c to continue without paging--
    at /home/bellaz/.local/include/mozjs-68/js/Value.h:750
750     MOZ_ASSERT(isObject());
(gdb) backtrace
#0  0x000055555576a400 in JS::Value::toObject (this=0x2ea6c5981548)
    at /home/bellaz/.local/include/mozjs-68/js/Value.h:750
#1  0x0000555555db7fd7 in JSI_GUI::GUIProxy::delete_ (
    this=0x5555562b24b0 <JSI_GUI::GUIProxy::singleton>, cx=0x5555562ff100, proxy=..., id=...,
    result=...) at ../../../source/gui/Scripting/JSInterface_IGUIObject.cpp:341
#2  0x00007ffff72af37d in js::Proxy::delete_ (cx=0x5555562ff100, proxy=..., id=..., result=...)
    at /home/bellaz/Projects/firefox-68.9.0/js/src/proxy/Proxy.cpp:139
#3  0x00007ffff72b37f8 in proxy_DeleteProperty (cx=0x5555562ff100, obj=..., id=..., result=...)
    at /home/bellaz/Projects/firefox-68.9.0/js/src/proxy/Proxy.cpp:664
#4  0x00007ffff6c55d20 in js::DeleteProperty (cx=0x5555562ff100, obj=..., id=..., result=...)
    at /home/bellaz/Projects/firefox-68.9.0/js/src/vm/ObjectOperations-inl.h:344
#5  Interpret (cx=0x5555562ff100, state=...)
    at /home/bellaz/Projects/firefox-68.9.0/js/src/vm/Interpreter.cpp:2640
#6  0x00007ffff6c4d927 in js::RunScript (cx=0x5555562ff100, state=...)
    at /home/bellaz/Projects/firefox-68.9.0/js/src/vm/Interpreter.cpp:423
#7  0x00007ffff6c67141 in js::InternalCallOrConstruct (cx=0x5555562ff100, args=...,
    construct=js::NO_CONSTRUCT) at /home/bellaz/Projects/firefox-68.9.0/js/src/vm/Interpreter.cpp:563
#8  0x00007ffff6c685fd in js::Call (cx=0x7ffff5a554b0 <_IO_stdfile_2_lock>, fval=..., thisv=...,
    args=..., rval=...) at /home/bellaz/Projects/firefox-68.9.0/js/src/vm/Interpreter.cpp:606
#9  0x00007ffff72500b4 in JS_CallFunction (cx=0x5555562ff100, obj=..., fun=..., args=..., rval=...)
    at /home/bellaz/Projects/firefox-68.9.0/js/src/jsapi.cpp:2629
#10 0x0000555555d7a822 in IGUIObject::ScriptEventWithReturn (this=0x555557859220, eventName=...,
    paramData=...) at ../../../source/gui/ObjectBases/IGUIObject.cpp:461
#11 0x0000555555d7a3c2 in IGUIObject::ScriptEventWithReturn (this=0x555557859220, eventName=...)
    at ../../../source/gui/ObjectBases/IGUIObject.cpp:429
#12 0x0000555555d7a228 in IGUIObject::ScriptEvent (this=0x555557859220, eventName=...)
    at ../../../source/gui/ObjectBases/IGUIObject.cpp:419
#13 0x0000555555d564a9 in IGUIObject::RecurseObject<CStr8 const&> (this=0x555557859220,
    isRestricted=NULL, callbackFunction=
    (void (IGUIObject::*)(IGUIObject * const, const CStr8 &)) 0x555555d7a1f6 <IGUIObject::ScriptEvent(CStr8 const&)>) at ../../../source/gui/ObjectBases/IGUIObject.h:301
#14 0x0000555555d56525 in IGUIObject::RecurseObject<CStr8 const&> (this=0x555557525718,
    isRestricted=NULL, callbackFunction=
    (void (IGUIObject::*)(IGUIObject * const, const CStr8 &)) 0x555555d7a1f6 <IGUIObject::ScriptEvent(CStr8 const&)>) at ../../../source/gui/ObjectBases/IGUIObject.h:305
#15 0x0000555555d4a2cc in CGUI::SendEventToAll (this=0x5555575256b0, eventName=...)
    at ../../../source/gui/CGUI.cpp:276
#16 0x0000555555d4a20f in CGUI::TickObjects (this=0x5555575256b0) at ../../../source/gui/CGUI.cpp:270
#17 0x0000555555d2dec9 in CGUIManager::TickObjects (this=0x555557373320)
    at ../../../source/gui/GUIManager.cpp:357
#18 0x00005555556ce6e0 in Frame () at ../../../source/main.cpp:386
#19 0x00005555556d00d7 in RunGameOrAtlas (argc=2, argv=0x7fffffffdd88) at ../../../source/main.cpp:639
#20 0x00005555556d0920 in main (argc=2, argv=0x7fffffffdd88) at ../../../source/main.cpp:685
(gdb)