(gdb) r --dedicated='non-existing'
Starting program: /home/user/dev/widelands/widelands --dedicated='non-existing'
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Set home directory: /home/user/.widelands
Adding directory:./.
Adding directory:/usr/share/games/widelands
Adding directory:.
Adding directory: /home/user/dev/widelands
Widelands executable directory: /home/user/dev/widelands/
localedir: /home/user/dev/widelands/locale
selected language: en
using locale en_US.utf-8
[] Section [global], key 'disable_fx' not used (did you spell the name correctly?)
[] Section [global], key 'disable_music' not used (did you spell the name correctly?)
[] Section [global], key 'EXENAME' not used (did you spell the name correctly?)
InternetGaming: Connecting to the metaserver.
InternetGaming: Sending login request.
InternetGaming: Client dedicated1 logged in.
[Host]: starting up.
InternetGaming: Client opened a game with the name dedicated.
Fatal exception: Widelands could not load the file "non-existing". The file format seems to be incompatible.
terminate called after throwing an instance of 'warning'
  what():  Widelands could not load the file "non-existing". The file format seems to be incompatible.

Program received signal SIGABRT, Aborted.
0x00007ffff56abf89 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56	../nptl/sysdeps/unix/sysv/linux/raise.c: Ingen slik fil eller filkatalog.
(gdb) bt
#0  0x00007ffff56abf89 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007ffff56af398 in __GI_abort () at abort.c:89
#2  0x00007ffff5fb76b5 in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3  0x00007ffff5fb5836 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007ffff5fb5863 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x00007ffff5fb5af6 in __cxa_rethrow () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x0000000000b4e621 in WLApplication::run (this=0x16fb0b0) at ../src/wlapplication.cc:467
#7  0x0000000000b4c366 in main (argc=2, argv=0x7fffffffde58) at ../src/main.cc:104