Minetest Debug Error V Server

In thread a578fb40:
/build/buildd/minetestc55-201310162147/src/tile.cpp:530: virtual irr::u32 TextureSource::getTextureId(const string&): Assertion 'result.key == name' failed.
Debug stacks:
DEBUG STACK FOR THREAD a578fb40:
#0  virtual void* MeshUpdateThread::Thread()
DEBUG STACK FOR THREAD b69b5700:
#0  int main(int, char**)
(Leftover data: #1  void ClientMap::renderMap(irr::video::IVideoDriver*, irr::s32))
(Leftover data: #2  virtual void ClientEnvironment::step(float))
(Leftover data: #3  void Client::Receive())
(Leftover data: #4  void Client::ProcessData(irr::u8*, irr::u32, irr::u16))
(Leftover data: #5  void MeshUpdateQueue::addBlock(v3s16, MeshMakeData*, bool, bool))
Aborted (core dumped)