To prevent digging into your source code I just attach the gdb backtrace. Regards Ron
################################################################# commandline: fgfs --airport=EDHI --aircraft=bo105 --enable-game-mode #################################################################
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1024 (LWP 16324)]
SGPropertyNode::getDoubleValue (this=0x776e7572) at props.cxx:1117
1117 if (_attr == (READ|WRITE) && _type == DOUBLE)
(gdb) bt
#0 SGPropertyNode::getDoubleValue (this=0x776e7572) at props.cxx:1117
#1 0x08383fce in update_helper (dt=0) at xmlauto.cxx:815
#2 0x0838475a in FGXMLAutopilot::update (this=0x9fd4cd8, dt=0)
at xmlauto.cxx:942
#3 0x0855449b in SGSubsystemGroup::Member::update (this=0x9fd4cf8,
delta_time_sec=0) at subsystem_mgr.cxx:225
#4 0x08553de2 in SGSubsystemGroup::update (this=0x8b6f3dc, delta_time_sec=0)
at subsystem_mgr.cxx:115
#5 0x0855480c in SGSubsystemMgr::update (this=0x8b6f3c0, delta_time_sec=0)
at subsystem_mgr.cxx:278
#6 0x08051ae8 in fgMainLoop () at main.cxx:451
#7 0x080a0481 in GLUTidle () at fg_os.cxx:113
#8 0x400571c6 in idleWait () from /usr/lib/libglut.so.3
#9 0x080554ce in fgMainInit (argc=1, argv=0xbfffe674) at main.cxx:958
#10 0x0804fff5 in main (argc=1, argv=0xbfffe674) at bootstrap.cxx:192
#11 0x403e67ee in __libc_start_main () from /lib/libc.so.6
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