Some Lua nil error

[sprunk]

No idea what exactly this is, noticed in somebody's infolog for an unrelated problem. Adjacent lines for context

[t=00:00:41.506098][f=-000001] [LuaMenu] Scanning: libs/i18n/LuaMenu/widgets
[t=00:00:41.506111][f=-000001] [LuaMenu] Scanning: libs/liblobby/LuaMenu/widgets
[t=00:00:41.507075][f=-000001] [LuaMenu] Warning: Missing GetInfo() in: base64.lua
[t=00:00:41.507393][f=-000001] [LuaMenu] Error: Failed to load: debugfunctions.lua  ([LuaVFS::Include(synced=false)][pcall] file=LuaMenu/Addons/debugfunctions.lua error=2 ([string "LuaMenu/Addons/debugfunctions.lua"]:9: bad argument #1 to '(for generator)' (table expected, got nil)) ptop=3 cenv=true vfsmode=Mmeb)
[t=00:00:41.507510][f=-000001] [LuaMenu] Warning: Missing GetInfo() in: engineversion.lua
[t=00:00:41.507727][f=-000001] Spring.GetWindowGeometry, 3440, 1440, 0, 0, 0, 0, 0, 0
[t=00:00:41.507735][f=-000001] Spring.GetViewGeometry, 3440, 1440, 0, 0
[t=00:00:41.507754][f=-000001] [LuaMenu] Warning: Missing GetInfo() in: function_override.lua