(gdb) bt
#0  0x00007f2aee33bcf4 in ?? () from /usr/lib/libNGStreams.so.4.9
#1  0x00007f2aee85c397 in ?? () from /usr/lib/libNGMime.so.4.9
#2  0x00007f2aee85ce01 in ?? () from /usr/lib/libNGMime.so.4.9
#3  0x00007f2aee86e846 in ?? () from /usr/lib/libNGMime.so.4.9
#4  0x00007f2aee86ee14 in ?? () from /usr/lib/libNGMime.so.4.9
#5  0x00007f2aee86b41b in ?? () from /usr/lib/libNGMime.so.4.9
#6  0x00007f2aee899e55 in ?? () from /usr/lib/libNGMime.so.4.9
#7  0x00007f2ae1e33076 in ?? () from /usr/lib/GNUstep/SOGo/Mailer.SOGo/./Mailer
#8  0x00007f2adf307faf in ?? ()
   from /usr/lib/GNUstep/SOGo/MailerUI.SOGo/./MailerUI
#9  0x00007f2adf307a0d in ?? ()
   from /usr/lib/GNUstep/SOGo/MailerUI.SOGo/./MailerUI
#10 0x00007f2adf307d90 in ?? ()
   from /usr/lib/GNUstep/SOGo/MailerUI.SOGo/./MailerUI
#11 0x00007f2aeec69fae in ?? () from /usr/lib/libNGObjWeb.so.4.9
#12 0x00007f2ae0714d73 in ?? () from /usr/lib/sogo/libSOGoUI.so.4.0
#13 0x00007f2aeecfb31f in ?? () from /usr/lib/libNGObjWeb.so.4.9
#14 0x00007f2aeecfb44b in ?? () from /usr/lib/libNGObjWeb.so.4.9
#15 0x00007f2aeecfb093 in ?? () from /usr/lib/libNGObjWeb.so.4.9
#16 0x00007f2aeecfb44b in ?? () from /usr/lib/libNGObjWeb.so.4.9
#17 0x00007f2aeecf594c in ?? () from /usr/lib/libNGObjWeb.so.4.9
#18 0x00007f2aeecf7e0d in ?? () from /usr/lib/libNGObjWeb.so.4.9
#19 0x00007f2aeec7bd0f in ?? () from /usr/lib/libNGObjWeb.so.4.9
#20 0x00007f2aeec3c09e in ?? () from /usr/lib/libNGObjWeb.so.4.9
#21 0x00007f2aeec3c3bd in ?? () from /usr/lib/libNGObjWeb.so.4.9
#22 0x00005596b0152c69 in ?? ()
#23 0x00007f2aeece6353 in ?? () from /usr/lib/libNGObjWeb.so.4.9
#24 0x00007f2aeece66c9 in ?? () from /usr/lib/libNGObjWeb.so.4.9
#25 0x00007f2aeece233e in ?? () from /usr/lib/libNGObjWeb.so.4.9
#26 0x00007f2aeece255e in ?? () from /usr/lib/libNGObjWeb.so.4.9
#27 0x00007f2aeece2967 in ?? () from /usr/lib/libNGObjWeb.so.4.9
#28 0x00007f2aeece2c4e in ?? () from /usr/lib/libNGObjWeb.so.4.9
#29 0x00007f2aed3ff0d7 in ?? () from /usr/lib/libgnustep-base.so.1.24
#30 0x00007f2aee09db23 in ?? () from /usr/lib/libNGExtensions.so.4.9
#31 0x00007f2aed506d2b in ?? () from /usr/lib/libgnustep-base.so.1.24
#32 0x00007f2aed445500 in ?? () from /usr/lib/libgnustep-base.so.1.24
#33 0x00007f2aed4459b2 in ?? () from /usr/lib/libgnustep-base.so.1.24
#34 0x00007f2aeec3b8c9 in ?? () from /usr/lib/libNGObjWeb.so.4.9
#35 0x00005596b0151db0 in ?? ()
#36 0x00007f2aeec853b4 in ?? () from /usr/lib/libNGObjWeb.so.4.9
#37 0x00007f2aeec85860 in ?? () from /usr/lib/libNGObjWeb.so.4.9
#38 0x00007f2aeec85f98 in ?? () from /usr/lib/libNGObjWeb.so.4.9
#39 0x00007f2aeec8702d in ?? () from /usr/lib/libNGObjWeb.so.4.9
#40 0x00007f2aeec8777d in WOWatchDogApplicationMain ()
   from /usr/lib/libNGObjWeb.so.4.9
#41 0x00005596b0150a79 in main ()
(gdb) quit