Cannot read property 'jqXHR' of undefined

I just did a minor change in the privacy policy but when I submitted the edit, it would not complete saving (the saving wheel kept spinning and spinning). While I was waiting, I went to the TOS (in a new browser tab) to do a change there too. After saving that edit without problems, I went back to the privacy policy, but the wheel was still spinning. So I went ahead and tried to edit the post again (in the same browser tab). Ironically, I found that the change was already made but I wasn’t sure whether it was really saved or whether I was just looking at the same unsaved editor content. So I clicked save to make sure it is saved. That’s when this error popped up.

Can you repro this @techapj?

I am unable to repro this error on latest Discourse version.

For what it’s worth, I just had this same issue with a recent Discourse version (commit c10941b, basically the stable branch from 2019-02-17, not a release).

I was able to reproduce it a few times, but then not anymore, and it’s the first time ever that I had this issue. So very much an edge case …

What happened:

  1. I did a major update to a complex wiki post (which is a Discourse manual we wrote for our purposes).

  2. As experienced by the OP, Discourse would not complete saving (the saving wheel kept spinning and spinning). I eventually cancelled the process.

  3. I tried to make the very same edit again, and this error popped up:

    TypeError: Cannot read property ‘jqXHR’ of undefined

    That was reproducible for several further attempts to make the same edit in this post.

  4. I tried to make an edit to a different post, and that went without problems. I tried to post the same edit that failed for the manual wiki as edit to the different post, and that worked without problems, too (so it does not seem to be connected to the posted content).

  5. I tried a small (few words) edit to the manual wiki where the original edit failed. That worked, but it took a long time (about two minutes).

  6. I tried the failed edit again on the manual wiki, and this time it worked. And all subsequent edits worked, too.

I found the following error log entries for the time and post where this issue happened:

(Edit: upon further inspection, that error in the logs seems rather unrelated as the log shows it also in multiple other cases, which did not involve the “TypeError: Cannot read property ‘jqXHR’ of undefined” error message on the client side. But I saved the JS file where the error happened, if somebody wants to look at it.)

Message (5 copies reported)
Uncaught Error: Not Found
Url: https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js
Line: 14
Column: 25883
Window Location: https://edgeryders.eu/t/discourse-user-manual-for-edgeryders-eu/6463/1
Backtrace
Error: Not Found
    at s (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:14:26084)
    at o (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:14:25941)
    at i (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:14:25836)
    at Object.trigger (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:17:26248)
    at https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:17:28250
    at e.invoke (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:3979)
    at e.flush (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:2902)
    at e.flush (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:4992)
    at e._end (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:9818)
    at e.end (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:6320)
    at e._run (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:10333)
    at e.run (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:6965)
    at a (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:4:29639)
    at Object.r.error (https://edgeryders.eu/assets/application-b7e1701c68247f1198a83883a70ad5264302ef5fd43e37b09ce6d0125baa133a.js:7:26015)
    at u (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:2:6854)
    at Object.fireWith [as rejectWith] (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:2:7603)
    at n (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:3:10363)
    at XMLHttpRequest.<anonymous> (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:3:15221)

Env
    hostname	server.edgeryders.eu
    process_id	27682
    application_version	2.2.1
    HTTP_HOST	edgeryders.eu
    REQUEST_URI	/logs/report_js_error
    REQUEST_METHOD	POST
    HTTP_USER_AGENT	Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/73.0.3683.75 Chrome/73.0.3683.75 Safari/537.36
    HTTP_ACCEPT	*/*
    HTTP_REFERER	https://edgeryders.eu/t/discourse-user-manual-for-edgeryders-eu/6463/1
    params
        message	Uncaught Error: Not Found Url: https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb3736
        url	https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06
        line	14
        column	25883
        window_location	https://edgeryders.eu/t/discourse-user-manual-for-edgeryders-eu/6463/1
        stacktrace	Error: Not Found at s (https://edgeryders.eu/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58

Sorry @tanius Akismet thought your post was spam for some reason and deleted it, I just went ahead and undeleted it.

@techAPJ can you re-test given this info?

¿Persiste este problema?

“No se puede leer el campo jqXHR” proviene de nuestro código personalizado de manejo de errores alrededor de las llamadas AJAX fallidas.

No, no persiste… no he visto el error en el último año. Pero al principio era claramente un caso límite y no era claramente reproducible, así que no lo tomaría como prueba de ausencia ahora…

Por cierto, hay otra parte del guardado fallido de publicaciones que podría mejorarse. Es decir, cuando guardar una publicación o una edición de publicación falla debido a un error de red, tarda muchísimo tiempo antes de que el sistema lo comunique. Me falta una forma de reenviar esa solicitud. El botón “Cancelar” no ayuda aquí, ya que provocaría la pérdida del contenido de la publicación o de la edición de la publicación.

Necesitamos un reproducible para hacer cualquier cosa. ¿Has probado a usar la pestaña de red en Chrome para cambiar a una red artificialmente inestable? ¿Eso podría servir para reproducirlo?

Este error se me presentó cuando estaba haciendo lo siguiente.
Todo se hizo en un plugin.

Estaba agregando un Validador a la clase Post… el contenido no importa, pero lo pondré por el bien de la respuesta.

frozen_string_literal: true

class MainPostValidator < ActiveModel::Validator
def validate(record)
puts ‘TTTTT’
p record

raw = record.raw

unless raw.present?
  post.errors.add :base, 'Este registro no es válido'
end

end

private
def some_complex_logic
# …
end
end

Antes de ejecutar el servidor con los nuevos cambios, tenía el sitio web abierto editando una publicación, listo para verificar si guardar los cambios activaba mi validador.

Reinicié el servidor, pero ¡no actualicé la página! Cuando toqué guardar cambios en la publicación, vi ese error. Desapareció una vez que actualicé la página, y tal vez también reinicié la instancia del servidor.

Todo esto se hizo en desarrollo local.

Espero que ayude :slight_smile:

El validador fue declarado en un archivo nuevo, y también el código extra de Post para aplicar el validador estaba en un archivo nuevo.

require_dependency 'post' Post.class_eval { include ActiveModel::Validations validates_with MainPostValidator }