Crash on some lpe whith path parameters at Ctrl+Z

Program received signal SIGSEGV, Segmentation fault.
Inkscape::UI::PathManipulator::_getStrokeTolerance (this=this@entry=0x77b86f0)
    at ../../bspline+spirolive/src/ui/tool/path-manipulator.cpp:1641
1641	    if (_path && _path->style && !_path->style->stroke.isNone()) {
(gdb) bt
#0  Inkscape::UI::PathManipulator::_getStrokeTolerance (
    this=this@entry=0x77b86f0)
    at ../../bspline+spirolive/src/ui/tool/path-manipulator.cpp:1641
#1  0x00000000009d46a5 in Inkscape::UI::PathManipulator::_updateDragPoint (
    this=0x77b86f0, evp=...)
    at ../../bspline+spirolive/src/ui/tool/path-manipulator.cpp:1612
#2  0x00000000009d4841 in event (event=<optimized out>, this=<optimized out>)
    at ../../bspline+spirolive/src/ui/tool/path-manipulator.cpp:168
#3  Inkscape::UI::PathManipulator::event (this=<optimized out>,
    event=<optimized out>)
    at ../../bspline+spirolive/src/ui/tool/path-manipulator.cpp:161
#4  0x00000000009c94e1 in Inkscape::UI::MultiPathManipulator::event (
    this=<optimized out>, event_context=0x77c62a0, event=0x43b9510)
    at ../../bspline+spirolive/src/ui/tool/multi-path-manipulator.cpp:750
#5  0x0000000000a0e144 in Inkscape::UI::Tools::NodeTool::root_handler (
    this=0x77c62a0, event=0x43b9510)
    at ../../bspline+spirolive/src/ui/tools/node-tool.cpp:420
#6  0x0000000000a2f412 in Inkscape::UI::Tools::sp_event_context_virtual_root_handler (event_context=<optimized out>, event=0x43b9510)
    at ../../bspline+spirolive/src/ui/tools/tool-base.cpp:986
#7  0x000000000049c92c in sp_desktop_root_handler (event=0x43b9510, desktop=
    0x1f09c00) at ../../bspline+spirolive/src/desktop-events.cpp:74
#8  0x00000000006f8d21 in sp_marshal_BOOLEAN__POINTER (closure=0x315b450,
---Type <return> to continue, or q <return> to quit---bt
    return_value=0x7fffffffd700, n_param_values=<optimized out>,
    param_values=0x7fffffffd630, invocation_hint=<optimized out>,
    marshal_data=<optimized out>) at helper/sp-marshal.cpp:124
#9  0x00007ffff04e66e0 in g_closure_invoke ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#10 0x00007ffff04f7750 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007ffff04ff2db in g_signal_emit_valist ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#12 0x00007ffff04ff852 in g_signal_emit ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x000000000063e6af in emitEvent (event=<optimized out>,
    canvas=<optimized out>)
    at ../../bspline+spirolive/src/display/sp-canvas.cpp:1600
#14 SPCanvasImpl::emitEvent (canvas=<optimized out>, event=<optimized out>)
    at ../../bspline+spirolive/src/display/sp-canvas.cpp:1487
#15 0x000000000063eb36 in SPCanvasImpl::handleMotion (widget=0x30c5000,
    event=0x43b9c00) at ../../bspline+spirolive/src/display/sp-canvas.cpp:1843
#16 0x00007ffff6986099 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#17 0x00007ffff04e66e0 in g_closure_invoke ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#18 0x00007ffff04f74d0 in ?? ()
---Type <return> to continue, or q <return> to quit---q
 from /usr/lib/x86_64-linux-gnu/libgobject-2.0.soQuit