sdts gdal ogr failure

(gdb) set args ./ogr_sdts.py
(gdb) r
  TEST: ogr_sdts_1 ...
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff4d0691e in SDTSRawPolygon::AddEdgeToRing (this=this@entry=0xbc64a0, nVertToAdd=<optimized out>, padfXToAdd=<optimized out>,
    padfYToAdd=<optimized out>, padfZToAdd=<optimized out>, bReverse=<optimized out>, bDropVertex=bDropVertex@entry=0)
    at sdtspolygonreader.cpp:170
170	        padfZ[nVertices] = padfZToAdd[i];
(gdb) bt
#0  0x00007ffff4d0691e in SDTSRawPolygon::AddEdgeToRing (this=this@entry=0xbc64a0, nVertToAdd=<optimized out>,
    padfXToAdd=<optimized out>, padfYToAdd=<optimized out>, padfZToAdd=<optimized out>, bReverse=<optimized out>,
    bDropVertex=bDropVertex@entry=0) at sdtspolygonreader.cpp:170
#1  0x00007ffff4d06da7 in SDTSRawPolygon::AssembleRings (this=0xbc64a0) at sdtspolygonreader.cpp:420
#2  0x00007ffff4d07118 in SDTSPolygonReader::AssembleRings (this=0xb00070, poTransfer=0xb61510, iPolyLayer=7)
    at sdtspolygonreader.cpp:625
#3  0x00007ffff50ff9f5 in OGRSDTSLayer::GetNextUnfilteredFeature (this=this@entry=0xb00360) at ogrsdtslayer.cpp:297
#4  0x00007ffff50ffa91 in OGRSDTSLayer::GetNextFeature (this=0xb00360) at ogrsdtslayer.cpp:439
#5  0x00007ffff508ca01 in OGRLayer::GetFeatureCount (this=0xb00360, bForce=112944) at ogrlayer.cpp:181
#6  0x00007fffe94985c4 in OGRLayerShadow_GetFeatureCount (force=<optimized out>, self=0xb00360) at extensions/ogr_wrap.cpp:3840
#7  _wrap_Layer_GetFeatureCount (args=<optimized out>, kwargs=<optimized out>) at extensions/ogr_wrap.cpp:8924
#8  0x000000000049c4d9 in PyEval_EvalFrameEx ()
#9  0x00000000004a090c in PyEval_EvalCodeEx ()
#10 0x000000000049ab45 in PyEval_EvalFrameEx ()
#11 0x0000000000499ef2 in PyEval_EvalFrameEx ()
#12 0x0000000000499ef2 in PyEval_EvalFrameEx ()
#13 0x0000000000499ef2 in PyEval_EvalFrameEx ()
#14 0x00000000004a1634 in ?? ()
#15 0x000000000044e4a5 in PyRun_FileExFlags ()
#16 0x000000000044ec9f in PyRun_SimpleFileExFlags ()
#17 0x000000000044f904 in Py_Main ()
#18 0x00007ffff7818ec5 in __libc_start_main (main=0x44f9c2 <main>, argc=2, argv=0x7fffffffe108, init=<optimized out>,
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe0f8) at libc-start.c:287
#19 0x0000000000578c4e in _start ()