Dict->List Crash

Process 60206 stopped
* thread #1: tid = 0xa1a31, 0x00007fff881e3282 libsystem_kernel.dylib`__pthread_kill + 10, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
    frame #0: 0x00007fff881e3282 libsystem_kernel.dylib`__pthread_kill + 10
libsystem_kernel.dylib`__pthread_kill + 10:
-> 0x7fff881e3282:  jae    0x7fff881e328c            ; __pthread_kill + 20
   0x7fff881e3284:  movq   %rax, %rdi
   0x7fff881e3287:  jmp    0x7fff881deca3            ; cerror_nocancel
   0x7fff881e328c:  retq   
(lldb) bt
* thread #1: tid = 0xa1a31, 0x00007fff881e3282 libsystem_kernel.dylib`__pthread_kill + 10, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
  * frame #0: 0x00007fff881e3282 libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff8e3304c3 libsystem_pthread.dylib`pthread_kill + 90
    frame #2: 0x00007fff8bd1bb73 libsystem_c.dylib`abort + 129
    frame #3: 0x000000010019cd44 irmsde`Tcl_PanicVA(format=0x00000001002371c4, argList=0x00007fff5fbfe150) + 1172 at tclPanic.c:123
    frame #4: 0x000000010019ceba irmsde`Tcl_Panic(format=0x00000001002371c4) + 362 at tclPanic.c:153
    frame #5: 0x00000001001ca0b2 irmsde`Ptr2Block(ptr=0x000000010ae8ca70) + 98 at tclThreadAlloc.c:781
    frame #6: 0x00000001001c9ec2 irmsde`TclpFree(ptr=0x000000010ae8ca70) + 82 at tclThreadAlloc.c:407
    frame #7: 0x0000000100111cbd irmsde`DeleteChainTable(dict=0x000000010ff32810) + 173 at tclDictObj.c:276
    frame #8: 0x000000010010a685 irmsde`DeleteDict(dict=0x000000010ff32810) + 21 at tclDictObj.c:467
    frame #9: 0x0000000100108691 irmsde`FreeDictInternalRep(dictPtr=0x0000000110947b50) + 65 at tclDictObj.c:438
    frame #10: 0x00000001001869f2 irmsde`SetListFromAny(interp=0x0000000102022010, objPtr=0x0000000110947b50) + 1314 at tclListObj.c:1898
    frame #11: 0x0000000100186fc0 irmsde`Tcl_ListObjGetElements(interp=0x0000000102022010, listPtr=0x0000000110947b50, objcPtr=0x00007fff5fbfe474, objvPtr=0x00007fff5fbfe478) + 112 at tclListObj.c:473
    frame #12: 0x0000000103504ae5 tcl_ytm9Aj`SimNode_nodeeval(interp=0x0000000102022010, p=0x000000010f973410, body=0x0000000107f1ef40, writeback=0) + 85 at cstruct_simnode.c:1196
    frame #13: 0x000000010350f3cb tcl_ytm9Aj`SimNode_method_foreach(simulator=0x0000000103540c08, interp=0x0000000102022010, objc=2, objv=0x00000001110d9ba0) + 219 at cstruct_simnode.c:3298
    frame #14: 0x000000010003d751 irmsde`Dispatch(data=0x00000001109ae2e8, interp=0x0000000102022010, result=0) + 129 at tclBasic.c:4359
    frame #15: 0x000000010003927c irmsde`TclNRRunCallbacks(interp=0x0000000102022010, result=0, rootPtr=0x0000000108605680) + 172 at tclBasic.c:4392
    frame #16: 0x000000010003ba40 irmsde`TclEvalObjEx(interp=0x0000000102022010, objPtr=0x0000000108498920, flags=131072, invoker=0x0000000000000000, word=0) + 96 at tclBasic.c:5958
    frame #17: 0x0000000100038923 irmsde`Tcl_EvalObjEx(interp=0x0000000102022010, objPtr=0x0000000108498920, flags=131072) + 51 at tclBasic.c:5939
    frame #18: 0x000000010375f8bc libtk8.6.dylib`Ttk_InvokeEnsemble + 187
    frame #19: 0x00000001037666b7 libtk8.6.dylib`WidgetInstanceObjCmd + 80
    frame #20: 0x000000010003d751 irmsde`Dispatch(data=0x0000000108603e28, interp=0x0000000102022010, result=0) + 129 at tclBasic.c:4359
    frame #21: 0x000000010003927c irmsde`TclNRRunCallbacks(interp=0x0000000102022010, result=0, rootPtr=0x0000000108604510) + 172 at tclBasic.c:4392
    frame #22: 0x000000010003ba40 irmsde`TclEvalObjEx(interp=0x0000000102022010, objPtr=0x000000010a08bb60, flags=0, invoker=0x0000000000000000, word=0) + 96 at tclBasic.c:5958
    frame #23: 0x0000000100038923 irmsde`Tcl_EvalObjEx(interp=0x0000000102022010, objPtr=0x000000010a08bb60, flags=0) + 51 at tclBasic.c:5939
    frame #24: 0x0000000103766f27 libtk8.6.dylib`TtkWidgetInstateCommand + 151
    frame #25: 0x000000010375f8bc libtk8.6.dylib`Ttk_InvokeEnsemble + 187
    frame #26: 0x00000001037666b7 libtk8.6.dylib`WidgetInstanceObjCmd + 80
    frame #27: 0x000000010003d751 irmsde`Dispatch(data=0x000000010a168648, interp=0x0000000102022010, result=0) + 129 at tclBasic.c:4359
    frame #28: 0x000000010003927c irmsde`TclNRRunCallbacks(interp=0x0000000102022010, result=0, rootPtr=0x000000010a0a6e90) + 172 at tclBasic.c:4392
    frame #29: 0x000000010003ba40 irmsde`TclEvalObjEx(interp=0x0000000102022010, objPtr=0x0000000103bf3c90, flags=0, invoker=0x0000000000000000, word=0) + 96 at tclBasic.c:5958
    frame #30: 0x0000000100038923 irmsde`Tcl_EvalObjEx(interp=0x0000000102022010, objPtr=0x0000000103bf3c90, flags=0) + 51 at tclBasic.c:5939
    frame #31: 0x0000000103766f27 libtk8.6.dylib`TtkWidgetInstateCommand + 151
    frame #32: 0x000000010375f8bc libtk8.6.dylib`Ttk_InvokeEnsemble + 187
    frame #33: 0x00000001037666b7 libtk8.6.dylib`WidgetInstanceObjCmd + 80
    frame #34: 0x000000010003d751 irmsde`Dispatch(data=0x00000001084bc418, interp=0x0000000102022010, result=0) + 129 at tclBasic.c:4359
    frame #35: 0x000000010003927c irmsde`TclNRRunCallbacks(interp=0x0000000102022010, result=0, rootPtr=0x0000000102819b60) + 172 at tclBasic.c:4392
    frame #36: 0x0000000100038f99 irmsde`Tcl_EvalObjv(interp=0x0000000102022010, objc=4, objv=0x0000000102026a20, flags=2097168) + 89 at tclBasic.c:4123
    frame #37: 0x000000010003aac8 irmsde`TclEvalEx(interp=0x0000000102022010, script=0x00007fff5fbfef08, numBytes=190, flags=131072, line=1, clNextOuter=0x0000000000000000, outerScript=0x00007fff5fbfef08) + 3288 at tclBasic.c:5261
    frame #38: 0x0000000100039de1 irmsde`Tcl_EvalEx(interp=0x0000000102022010, script=0x00007fff5fbfef08, numBytes=190, flags=131072) + 65 at tclBasic.c:4926
    frame #39: 0x00000001036bd8d6 libtk8.6.dylib`Tk_BindEvent + 3870
    frame #40: 0x00000001036c2f7b libtk8.6.dylib`TkBindEventProc + 347
    frame #41: 0x00000001036cabf0 libtk8.6.dylib`Tk_HandleEvent + 1542
    frame #42: 0x00000001036cb124 libtk8.6.dylib`WindowEventProc + 96
    frame #43: 0x0000000100196837 irmsde`Tcl_ServiceEvent(flags=-3) + 231 at tclNotify.c:670
    frame #44: 0x0000000100196bf7 irmsde`Tcl_DoOneEvent(flags=-3) + 183 at tclNotify.c:903
    frame #45: 0x000000010012795a irmsde`Tcl_VwaitObjCmd(clientData=0x0000000000000000, interp=0x0000000102022010, objc=2, objv=0x0000000102828c60) + 234 at tclEvent.c:1405
    frame #46: 0x000000010003d751 irmsde`Dispatch(data=0x000000010281f748, interp=0x0000000102022010, result=0) + 129 at tclBasic.c:4359
    frame #47: 0x000000010003927c irmsde`TclNRRunCallbacks(interp=0x0000000102022010, result=0, rootPtr=0x0000000000000000) + 172 at tclBasic.c:4392
    frame #48: 0x0000000100038f99 irmsde`Tcl_EvalObjv(interp=0x0000000102022010, objc=3, objv=0x00000001020262f0, flags=2097168) + 89 at tclBasic.c:4123
    frame #49: 0x000000010003aac8 irmsde`TclEvalEx(interp=0x0000000102022010, script=0x0000000102860e10, numBytes=7930, flags=0, line=317, clNextOuter=0x0000000000000000, outerScript=0x0000000102860e10) + 3288 at tclBasic.c:5261
    frame #50: 0x0000000100181483 irmsde`Tcl_FSEvalFileEx(interp=0x0000000102022010, pathPtr=0x000000010082d030, encodingName=0x0000000000000000) + 1075 at tclIOUtil.c:1815
    frame #51: 0x000000010018cf9a irmsde`Tcl_MainEx(argc=-1, argv=0x00007fff5fbffaa0, appInitProc=0x0000000100019120, interp=0x0000000102022010) + 1274 at tclMain.c:417
    frame #52: 0x000000010001923e irmsde`main(argc=2, argv=0x00007fff5fbffa90) + 110 at tclsh_main.c:19
    frame #53: 0x00007fff8d6765c9 libdyld.dylib`start + 1
(lldb)