minetest.read_schematic crash with symbols

Thread 16 "Server" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffc8e226c0 (LWP 184368)]
0x00007ffff7174dd9 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0  0x00007ffff7174dd9 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff7b0baf7 in lua_pushstring () from /lib/x86_64-linux-gnu/libluajit-5.1.so.2
#2  0x00005555559d70d9 in ModApiMapgen::l_read_schematic (L=0x7fffdeebe380, L@entry=<error reading variable: value has been optimized out>)
    at ./src/script/lua_api/l_mapgen.cpp:1748
#3  0x000055555597a926 in script_exception_wrapper (L=0x7fffdeebe380, f=<optimized out>) at ./src/script/common/c_internal.cpp:40
#4  0x00007ffff7ab6a9b in ?? () from /lib/x86_64-linux-gnu/libluajit-5.1.so.2
#5  0x00007ffff7b111ee in lua_pcall () from /lib/x86_64-linux-gnu/libluajit-5.1.so.2
#6  0x0000555555984a21 in ScriptApiBase::runCallbacksRaw (this=0x5555561adb48, nargs=2, mode=RUN_CALLBACKS_MODE_OR_SC,
    fxn=0x555555dbecee "on_chat_message") at ./src/script/cpp_api/s_base.cpp:292
#7  0x000055555599b6d1 in ScriptApiServer::on_chat_message (this=this@entry=0x5555561ad9a0, name=..., message=...)
    at ./src/script/cpp_api/s_server.cpp:152
#8  0x0000555555c1f893 in Server::handleChat (this=this@entry=0x555556435a20, name=..., wmessage=...,
    check_shout_priv=check_shout_priv@entry=true, player=player@entry=0x7fffb0034b40) at ./src/server.cpp:3059
#9  0x0000555555954e7e in Server::handleCommand_ChatMessage (this=0x555556435a20, pkt=<optimized out>)
    at ./src/network/serverpackethandler.cpp:768
#10 0x0000555555c21a77 in Server::handleCommand (pkt=0x7fffc8e1e990, this=0x555556435a20) at ./src/server.cpp:1154
#11 Server::ProcessData (this=0x555556435a20, pkt=0x7fffc8e1e990) at ./src/server.cpp:1229
#12 0x0000555555c21c32 in Server::Receive (this=0x555556435a20) at ./src/server.cpp:1058
#13 0x0000555555c333c2 in ServerThread::run (this=0x55555643e160) at ./src/server.cpp:122
#14 0x0000555555a2b776 in Thread::threadProc (thr=0x55555643e160) at ./src/threading/thread.cpp:188
#15 0x00007ffff72d44a3 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
#16 0x00007ffff70a7fd4 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#17 0x00007ffff712866c in ?? () from /lib/x86_64-linux-gnu/libc.so.6
(gdb)