Exception : Call to a member function summarise() on null

Exception : Call to a member function summarise() on null

di Ulrike Albers -
Numero di risposte: 8

Hello,

I should have posted an answer in this discussion, but it is closed.

We use Moodle 3.6; in a quiz, there is a problem with the statistics: we get the following error:

Exception : Call to a member function summarise() on null

The same error is displayed when one clicks on recalculate grades. It is possible that the teacher modified some question after a students' attempt (I wonder how, though, as Moodle usually prevents us from doing that). Is there a way to access the statistics?

Thank you in advance!


Media dei voti:  -
In riposta a Ulrike Albers

Re: Exception : Call to a member function summarise() on null

di Tim Hunt -
Immagine Core developers Immagine Documentation writers Immagine Particularly helpful Moodlers Immagine Peer reviewers Immagine Plugin developers
This looks like MDL-66095 (sorry, not fixed yet) although a temporary work-around was added in MDL-66115, so if you upgrade to the latest 3.6.x release, things should start working.

And, more generally, be very, very careful editing questions after students had attempted them.
Media dei voti: Useful (2)
In riposta a Tim Hunt

Re: Exception : Call to a member function summarise() on null

di Ulrike Albers -
Thank you very much for your answer Tim! I'm very sorry I forgot to subscribe to the discussion so I just saw it know. I will let teachers know.
Media dei voti:  -
In riposta a Tim Hunt

Re: Exception : Call to a member function summarise() on null

di heli g -
We are experiencing this issue on 3.5, but cannot identify which files were modified in the MDL-6611 temporary work-around.
Assistance would be greatly appreciated.
Media dei voti:  -
In riposta a heli g

Re: Exception : Call to a member function summarise() on null

di Tim Hunt -
Immagine Core developers Immagine Documentation writers Immagine Particularly helpful Moodlers Immagine Peer reviewers Immagine Plugin developers
That is the wrong issue number. The right issue number is in my post above.

And, the code change for that fix is https://github.com/moodle/moodle/commit/39260e3eadc71613320d80b99c3d4352b9994e48
Media dei voti: Useful (1)
In riposta a Tim Hunt

Re: Exception : Call to a member function summarise() on null

di heli g -
Thank you so much Tim - that fixed it. You really are amazing!
(Apologies for the typo in the post above, I was indeed looking at MDL-66115)
Media dei voti:  -
In riposta a heli g

Re: Exception : Call to a member function summarise() on null

di heli g -
Just in case anyone else is as clueless as me, if you can't find a link to code updates in the tracker: Go to https://github.com/moodle/moodle and enter the issue number in the Search box. The link to the code change is under Commits.
It seems so obvious now, but not so much when I was panicking late last night... Thanks again for your prompt assistance Tim.
Media dei voti:  -
In riposta a heli g

Re: Exception : Call to a member function summarise() on null

di heli g -
The issue was identified because forum posts were not being emailed. It has temporarily been resolved by disabling \core\task\legacy_plugin_cron_task - but what effect will this have on Quizzes or any other mods that may be using legacy cron?
Media dei voti:  -
In riposta a heli g

Re: Exception : Call to a member function summarise() on null

di Tim Hunt -
Immagine Core developers Immagine Documentation writers Immagine Particularly helpful Moodlers Immagine Peer reviewers Immagine Plugin developers
To be honest, I don't remember exactly what the situation was in Moodle 3.5.

There was a big push to get all the legacy cron converted to use the new scheduled task system (MDL-61164). Some of that was done for 3.5, but some of it was not finished until 3.7 (See the linked issues.)
Media dei voti: Useful (1)