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

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

- Ulrike Albers の投稿
返信数: 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!


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Ulrike Albers への返信

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

- Tim Hunt の投稿
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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.
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Tim Hunt への返信

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

- Ulrike Albers の投稿
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.
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Tim Hunt への返信

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

- heli g の投稿
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.
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heli g への返信

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

- Tim Hunt の投稿
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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
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Tim Hunt への返信

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

- heli g の投稿
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)
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heli g への返信

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

- heli g の投稿
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.
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heli g への返信

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

- heli g の投稿
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?
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heli g への返信

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

- Tim Hunt の投稿
画像 Core developers 画像 Documentation writers 画像 Particularly helpful Moodlers 画像 Peer reviewers 画像 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.)
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