Unhandled exception in stacks command

[Zeno-]

19:41:15: ERROR[main]: ERROR: An unhandled exception occurred: ...worldmods/Minetest-WorldEdit/worldedit_commands/init.lua:621: attempt to perform arithmetic on a nil value

[Uberi]

Hi Zeno, what chat command did you enter immediately before this error occurred? It would make it much easier to fix if we knew what the problem was.

[Zeno-]

Hi Uberi, unfortuantely it wasn't a command I entered (it's what caused my server crash), but I looked at the log and chatted with the person who was using WE at the time and we're 99.9% sure it was //stack. Unfortunately I haven't been able to reproduce it yet on my local/test server.

Some more info:

[Minetest-WorldEdit]$ git rev-parse HEAD
18efe50e1ea4ea5bb72ab2376cbae952049289ee

minetestserver 0.4.10-29-g6929206
Build info: VER=0.4.10-29-g6929206 BUILD_TYPE=Release RUN_IN_PLACE=0 USE_GETTEXT=1 USE_SOUND=0 USE_CURL=1 USE_FREETYPE=0 USE_LUAJIT=1 STATIC_SHAREDIR=/usr/local/share/minetest

$ luajit -v
LuaJIT 2.0.3 -- Copyright (C) 2005-2014 Mike Pall. http://luajit.org/