Treemacs: Error running timer

[XO39]

I'm getting this annoying error:

Debugger entered--Lisp error: "Error running timer ‘treemacs--process-file-events’: (wrong-type-argument arrayp nil)"
message("Error running timer%s: %S" " ‘treemacs--process-file-events’" (wrong-type-argument arrayp nil))
timer-event-handler([t 24009 65408 532009 nil treemacs--process-file-events nil nil 0])

Any idea what's the cause of it?

[Alexander-Miller]

This is a handler for dealing with file change events, so I need to know what's happening in the background in your file system and what treemacs is showing.
And make sure you are up-to-date, this area saw a lot of change recently.

[XO39]

..., so I need to know what's happening in the background in your file system and what treemacs is showing.

What should I do to help?

[Alexander-Miller]

Ideally a reproducible recipe like:

• you have project that shows files A, B, C
• you delete A and rename B to X from the shell
• that's when the error appears

Treemacs is aware when the files it is showing are changed, created, deleted or renamed, so there must be some combination of such events that causes problems.

And of course you should always use an up-to-date version of treemacs. What does calling treemacs-version output?

[XO39]

Sorry for the late replay, for some reason didn't get notified about your reply...

Treemacs v2.6-2019.11.16 @ 26.3

The error starts when I start creating (C-x C-f) and/or writing (C-x C-w) withing emacs, I don't do much of these operations from terminal when I'm using emacs.

I have one project in treemacs that uses both django and vue

[Alexander-Miller]

OK, try this:

• disable filewatch-mode
• change some file
• make sure it's actually changed from clean to modified in git or vice versa, or treemacs wont do anything
• enable debug on error
• run this:

(with-current-buffer (treemacs-get-local-buffer)
  (treemacs-update-single-file-git-state "/file/you/changed"))

If it works right you'll see your file change git color, if not there will be a stack trace.

[Alexander-Miller]

Closing here on account of inactivity. Feel free to reopen if the issue is still relevant.