bug: continuosly creation of stack traces "attempt to concatenate local 'end_line' (a nil value)"

[Jan Ph. H.]

Neovim version (nvim -v)

NVIM v0.10.0-dev-1217+g3387dc4a4

Operating system/version

Linux ASG148 5.15.0-84-generic

Describe the bug

I'll try provide more content, if necessary, but I suspect the source of the bug does not make it necessary in this case (nil value usage).

^I...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:139: in function <...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:135> function: builtin#18 ...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:108: attempt to concatenate local 'end_line' (a nil value)
Traceback
^I...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:108: in function 'on_stdout'
^I...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:139: in function <...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:135>
...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:108: attempt to concatenate local 'end_line' (a nil value)

stack traceback:
^I...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:108: in function 'on_stdout'
^I...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:139: in function <...im/lazy/overseer.nvim/lua/overseerstrategy/jobstart.lua:135> function: builtin#18 ...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:108: attempt to concatenate local 'end_line' (a nil value)

stack traceback:
^I...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:108: in function 'on_stdout'
^I...im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:139: in function <...im/lazy/overseer.nvim/lua/overseer/......im/lazy/overseer.nvim/lua/overseer/strategy/jobstart.lua:108: attempt to concatenate local 'end_line' (a nil value)
stack traceback:

After round about 3 minutes (writing of this issue) the problem stopped.

Steps To Reproduce

1. nvim -u min.lua

Expected Behavior

No nil value usage for concat flooding messages.

Minimal example file

Not minimal, but standard:

local has_overseer, overseer = pcall(require, "overseer")
local has_overseer_util, overseer_util = pcall(require, "overseer.util")

if not has_overseer then
  vim.print("no overseer")
  return
end
if not has_overseer_util then
  vim.print("no overseer.util")
  return
end

overseer.setup({
  actions = {
    ["open tab"] = {
      desc = "Open this task in a new tab",
      run = function(task)
        local bufnr = task:get_bufnr()
        if bufnr and vim.api.nvim_buf_is_valid(bufnr) then
          -- naming tabs requires involved statusline-like setup
          -- https://www.reddit.com/r/neovim/comments/pcpxwq/permanent_name_for_tab/
          vim.cmd.tabnew()
          overseer_util.set_term_window_opts()
          vim.api.nvim_win_set_buf(0, task:get_bufnr())
          overseer_util.scroll_to_end(0)
        end
      end,
    },
  },
  component_aliases = {
    default = {
    { "display_duration", detail_level = 2 },
    "on_output_summarize",
    "on_exit_set_status",
    --"on_complete_notify",
    --"on_complete_dispose", -- this should keep the task
    },
    -- Tasks from tasks.json use these components
    default_vscode = {
      "default",
      "on_result_diagnostics",
      "on_result_diagnostics_quickfix",
    },
  },
  strategy = { "jobstart", use_terminal = false },
  templates = { "builtin", "user.cpp_build", "user.run_script" },
})

Minimal init.lua

-- DO NOT change the paths and don't remove the colorscheme
local root = vim.fn.fnamemodify("./.repro", ":p")

-- set stdpaths to use .repro
for _, name in ipairs({ "config", "data", "state", "cache" }) do
  vim.env[("XDG_%s_HOME"):format(name:upper())] = root .. "/" .. name
end

-- bootstrap lazy
local lazypath = root .. "/plugins/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
  vim.fn.system({
    "git",
    "clone",
    "--filter=blob:none",
    "--single-branch",
    "https://github.com/folke/lazy.nvim.git",
    lazypath,
  })
end
vim.opt.runtimepath:prepend(lazypath)

-- install plugins
local plugins = {
  "folke/tokyonight.nvim",
  { "stevearc/dressing.nvim", config = true },
  {
    "stevearc/overseer.nvim",
    config = function()
      require("overseer").setup({
        -- add your overseer config here
      })
    end,
  },
  -- add any other plugins here
}
require("lazy").setup(plugins, {
  root = root .. "/plugins",
})

vim.cmd.colorscheme("tokyonight")
-- add anything else here

Additional context

I have 4 file-backed tabs and restart jobs in them. Originally started via :OverseerLoadBundle (3) and another one (1).

[Steven Arcangeli]

Weird...I'm not sure how that value could be nil, but I can add a simple guard for it