Possible caching issue

[mackensen]

Stack trace observed when the deletion of 900+ courses in 60 subcategories was in progress:

Debug info: Argument 1 passed to course_in_list::__construct() must be an instance of stdClass, null given, called in [dirroot]/lib/coursecatlib.php on line 1508 and defined
Error code: codingerror

Trace:

Stack trace: 
line 426 of /lib/setuplib.php: coding_exception thrown
line 2788 of /lib/coursecatlib.php: call to default_error_handler()
line 1508 of /lib/coursecatlib.php: call to course_in_list->__construct()
line 524 of /course/classes/management_renderer.php: call to coursecat->get_courses()
line 498 of /course/management.php: call to core_course_management_renderer->course_listing()

This was triggered by viewing a subcategory in the category management page. My guess is that it expected courses which no longer exist. After a few minutes the category page can be refreshed and loads without error (and no courses).

[mackensen]

I'm still observing the problem; I'm unsure if this is a core bug or if it points to a flaw in the deletion procedure the tool is using.

[kwiliarty]

I also see what I assume is the same problem. It's not a big deal, but I'm wondering if you believe 82e0887 addresses the issue.

[mackensen]

I didn't merge it so I'm thinking that it didn't resolve it.

[kwiliarty]

Okay. It's not a major problem, and as you point out it eventually resolves itself. Thanks for this helpful tool.