backtrace of crashing minetest

Reading symbols from /usr/games/minetest...(no debugging symbols found)...done.
[New LWP 9585]
[New LWP 9600]
[New LWP 9597]
[New LWP 9599]
[New LWP 9596]
[New LWP 9598]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `minetest --info --verbose'.
Program terminated with signal SIGABRT, Aborted.
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
58  ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
[Current thread is 1 (Thread 0x7f924ceb3e40 (LWP 9585))]
(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
#1  0x00007f9249b813ea in __GI_abort () at abort.c:89
#2  0x00007f9249b77bb7 in __assert_fail_base (fmt=<optimized out>, assertion=assertion@entry=0x56297c732460 "f->liquid_type == LIQUID_SOURCE", file=file@entry=0x56297c7323a8 "/build/minetest-RBdqfM/minetest-0.4.14+repack/src/nodedef.cpp", line=line@entry=938,
    function=function@entry=0x56297c732940 "virtual void CNodeDefManager::updateTextures(IGameDef*, void (*)(void*, irr::u32, irr::u32), void*)") at assert.c:92
#3  0x00007f9249b77c62 in __GI___assert_fail (assertion=0x56297c732460 "f->liquid_type == LIQUID_SOURCE", file=0x56297c7323a8 "/build/minetest-RBdqfM/minetest-0.4.14+repack/src/nodedef.cpp", line=938,
    function=0x56297c732940 "virtual void CNodeDefManager::updateTextures(IGameDef*, void (*)(void*, irr::u32, irr::u32), void*)") at assert.c:101
#4  0x000056297c66a34a in CNodeDefManager::updateTextures(IGameDef*, void (*)(void*, unsigned int, unsigned int), void*) ()
#5  0x000056297c4c65a8 in Client::afterContentReceived(irr::IrrlichtDevice*) ()
#6  0x000056297c56b4a3 in Game::createClient(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*, unsigned short) ()
#7  0x000056297c573992 in the_game(bool*, bool, InputHandler*, irr::IrrlichtDevice*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned short, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, ChatBackend&, bool*, SubgameSpec const&, bool) ()
#8  0x000056297c39d505 in ClientLauncher::run(GameParams&, Settings const&) ()
#9  0x000056297c39548f in main ()