#0  0x00007ffff515e04f in raise () from /usr/lib/libc.so.6
#1  0x00007ffff515f47a in abort () from /usr/lib/libc.so.6
#2  0x00007ffff5156ea7 in __assert_fail_base () from /usr/lib/libc.so.6
#3  0x00007ffff5156f52 in __assert_fail () from /usr/lib/libc.so.6
#4  0x0000000000e964bf in UI::Panel::has_focus (this=0x1dee458) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/ui_basic/panel.h:265
#5  0x000000000114b941 in UI::BaseDropdown::think (this=0x1dee458) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/ui_basic/dropdown.cc:146
#6  0x0000000000ea4283 in UI::Panel::do_think (this=0x1dee458) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/ui_basic/panel.cc:441
#7  0x0000000000ea42a2 in UI::Panel::do_think (this=0x1dedfd0) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/ui_basic/panel.cc:444
#8  0x0000000000ea42a2 in UI::Panel::do_think (this=0x1deded8) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/ui_basic/panel.cc:444
#9  0x0000000000ea42a2 in UI::Panel::do_think (this=0x1ded900) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/ui_basic/panel.cc:444
#10 0x0000000000ea3b4d in UI::Panel::do_run (this=0x1ded900) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/ui_basic/panel.cc:183
#11 0x0000000000c14eda in UI::Panel::run<FullscreenMenuBase::MenuTarget> (this=0x1ded900) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/ui_basic/panel.h:96
#12 0x0000000000f0f94a in OptionsCtrl::handle_menu (this=0x7fffffffdf80) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/ui_fsmenu/options.cc:510
#13 0x0000000000f0f8c7 in OptionsCtrl::OptionsCtrl (this=0x7fffffffdf80, s=...) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/ui_fsmenu/options.cc:506
#14 0x0000000000c0f12c in WLApplication::mainmenu (this=0x18ea1e0) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/wlapplication.cc:1004
#15 0x0000000000c0bc3e in WLApplication::run (this=0x18ea1e0) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/wlapplication.cc:441
#16 0x0000000000c0a2e1 in main (argc=1, argv=0x7fffffffe5f8) at /home/kaputtnik/Quellcode/widelands-repo/bug-536489-dropdown/src/main.cc:49