Selecting a non controllable object causes segmentation fault when updating the Lua Variable Tree

[allsey87]

As the title suggests, when an uncontrollable object is selected, there is a segfault that occurs when the QtLuaEditorWindow tries to get the 'variables' from the non controllable object.

Here is a backtrace from GDB:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff1f26cfc in argos::CQTOpenGLLuaMainWindow::VariableTreeChanged (this=0xe86bc0)
    at /home/allsey87/Workspace/ARGoS/argos3/src/plugins/simulator/visualizations/qt-opengl/qtopengl_lua_main_window.cpp:741
741       m_pcLuaVariableTree->setRootIndex(m_pcLuaVariableTree->model()->index(0, 0));
(gdb) backtrace
#0  0x00007ffff1f26cfc in argos::CQTOpenGLLuaMainWindow::VariableTreeChanged (this=0xe86bc0)
    at /home/allsey87/Workspace/ARGoS/argos3/src/plugins/simulator/visualizations/qt-opengl/qtopengl_lua_main_window.cpp:741
#1  0x00007ffff1ef9e7d in argos::CQTOpenGLLuaMainWindow::qt_static_metacall (_o=0xe86bc0, _c=QMetaObject::InvokeMetaMethod, _id=12, _a=0x2703ef0)
    at /home/allsey87/Workspace/ARGoS/argos3/build/plugins/simulator/visualizations/qt-opengl/moc_qtopengl_lua_main_window.cxx:83
#2  0x00007ffff08f9446 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3  0x00007ffff0e52b7b in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#4  0x00007ffff122cc4b in QMainWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#5  0x00007ffff0e02894 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#6  0x00007ffff0e07713 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#7  0x00007ffff1f03a6a in argos::CQTOpenGLApplication::notify (this=0x624a20, pc_receiver=0xe86bc0, pc_event=0x2627030)
    at /home/allsey87/Workspace/ARGoS/argos3/src/plugins/simulator/visualizations/qt-opengl/qtopengl_application.cpp:21
#8  0x00007ffff08dfe9c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007ffff08e3c6a in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#10 0x00007ffff090ef93 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#11 0x00007fffee487d53 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007fffee4880a0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007fffee488164 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007ffff090f3bf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#15 0x00007ffff0eaad5e in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#16 0x00007ffff08dec82 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#17 0x00007ffff08deed7 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#18 0x00007ffff08e3f67 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#19 0x00007ffff1f12501 in argos::CQTOpenGLRender::Execute (this=0x624850) at /home/allsey87/Workspace/ARGoS/argos3/src/plugins/simulator/visualizations/qt-opengl/qtopengl_render.cpp:61
#20 0x00007ffff7b3f0c1 in argos::CSimulator::Execute (this=0x623570) at /home/allsey87/Workspace/ARGoS/argos3/src/core/simulator/simulator.cpp:239
#21 0x0000000000415062 in main (n_argc=3, ppch_argv=0x7fffffffdd08) at /home/allsey87/Workspace/ARGoS/argos3/src/core/simulator/main.cpp:38
(gdb) 

[allsey87]

As expected, disabling the Lua editor from the experiment XML prevents this segfault as there is no Lau Window to be updated...