2015-09-29 13:09:57: ERROR[main]: UNRECOVERABLE error occurred. Stopping server. Please fix the following error:
2015-09-29 13:09:57: ERROR[main]: Lua: Node name is not set or is not a string!

In thread 7ffff7fdd740:
/home/telesight/minetest/src/server.cpp:511: void Server::step(float): A fatal error occurred: Lua: Node name is not set or is not a string!
Debug stacks:
DEBUG STACK FOR THREAD 7fffdbfff700:
#0  virtual void* EmergeThread::Thread()
(Leftover data: #1  MapBlock* ServerMap::loadBlock(v3s16))
(Leftover data: #2  void ServerMap::loadBlock(std::string*, v3s16, MapSector*, bool))
DEBUG STACK FOR THREAD 7fffe21fc700:
#0  virtual void* EmergeThread::Thread()
(Leftover data: #1  MapBlock* ServerMap::loadBlock(v3s16))
(Leftover data: #2  void ServerMap::loadBlock(std::string*, v3s16, MapSector*, bool))
DEBUG STACK FOR THREAD 7fffe2bfd700:
#0  virtual void* EmergeThread::Thread()
(Leftover data: #1  MapBlock* ServerMap::loadBlock(v3s16))
(Leftover data: #2  void ServerMap::loadBlock(std::string*, v3s16, MapSector*, bool))
DEBUG STACK FOR THREAD 7fffe35fe700:
#0  virtual void* EmergeThread::Thread()
(Leftover data: #1  MapBlock* ServerMap::loadBlock(v3s16))
(Leftover data: #2  void ServerMap::loadBlock(std::string*, v3s16, MapSector*, bool))
DEBUG STACK FOR THREAD 7fffe3fff700:
#0  virtual void* ServerThread::Thread()
#1  void Server::Receive()
(Leftover data: #2  void Server::SendBlocks(float))
(Leftover data: #3  void Server::SendBlockNoLock(irr::u16, MapBlock*, irr::u8, irr::u16))
(Leftover data: #4  void Server::SendBreath(irr::u16, irr::u16))
(Leftover data: #5  bool getCraftingResult(Inventory*, ItemStack&, std::vector<ItemStack>&, bool, IGameDef*))
DEBUG STACK FOR THREAD 7ffff7fdd740:
#0  int main(int, char**)
#1  Dedicated server branch
#2  void dedicated_server_loop(Server&, bool&)
#3  void Server::step(float)
[New Thread 0x7fffe21fc700 (LWP 8776)]
[New Thread 0x7fffe2bfd700 (LWP 8775)]
[New Thread 0x7fffdbfff700 (LWP 8774)]
[New Thread 0x7fffe35fe700 (LWP 8773)]
[New Thread 0x7fffe3fff700 (LWP 8768)]
[New Thread 0x7ffff1463700 (LWP 8767)]
[New Thread 0x7ffff1e64700 (LWP 8766)]

Program received signal SIGABRT, Aborted.
0x00007ffff6227267 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55
55	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  0x00007ffff6227267 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55
#1  0x00007ffff6228eca in __GI_abort () at abort.c:89
#2  0x0000000000605b64 in fatal_error_fn(char const*, char const*, unsigned int, char const*) ()
#3  0x000000000075ba80 in Server::step(float) ()
#4  0x0000000000769455 in dedicated_server_loop(Server&, bool&) ()
#5  0x0000000000470bd0 in main ()
(gdb) Quit
(gdb)