Hi, here's the gdb backtrace, hope it helps!
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x739c7230 in __GI_abort () at abort.c:79
#2 0x73a1751c in __libc_message (action=<optimized out>, fmt=<optimized out>)
at ../sysdeps/posix/libc_fatal.c:181
#3 0x73a996fc in __GI___fortify_fail_abort (
need_backtrace=need_backtrace@entry=false,
msg=0x73ae052c "stack smashing detected") at fortify_fail.c:28
#4 0x73a996c0 in __stack_chk_fail () at stack_chk_fail.c:29
#5 0x00635728 in FITSData::pixelToWCS (this=0x3fa01abc, this@entry=0x4d4a828,
wcsPixelPoint=..., wcsCoord=...)
at ./kstars/kstars/fitsviewer/fitsdata.cpp:1676
#6 0x008d80f8 in Ekos::Align::calculatePAHError (this=this@entry=0x417b1c8)
at ./kstars/kstars/ekos/align/align.cpp:5389
#7 0x008dbd5c in Ekos::Align::setWCSToggled (this=0x417b1c8,
result=<optimized out>) at ./kstars/kstars/ekos/align/align.cpp:5771
#8 0x74a3f380 in QMetaObject::activate(QObject*, int, int, void**) ()
from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
#9 0x0069b63c in FITSView::wcsToggled (this=this@entry=0x3e3bcc0,
_t1=<optimized out>, _t1@entry=true)
at ./obj-arm-linux-gnueabihf/kstars/KStarsLib_autogen/GB6ZSSQLTO/moc_fitsview.cpp:343
#10 0x00624990 in FITSView::syncWCSState (this=0x3e3bcc0)
at ./kstars/kstars/fitsviewer/fitsview.cpp:1635
#11 0x006a1884 in FITSView::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at ./obj-arm-linux-gnueabihf/kstars/KStarsLib_autogen/GB6ZSSQLTO/moc_fitsview.cpp:220
#12 0x74a3f244 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
#13 0x748667b8 in QFutureWatcherBase::event(QEvent*) () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
#14 0x75334db4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/arm-linux-gnueabihf/libQt5Widgets.so.5
#15 0x7533d2a8 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/arm-linux-gnueabihf/libQt5Widgets.so.5
#16 0x03e3bcdc in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
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