Method \ultimate_cron_job_ctools_export_ui::list_form_submit calling _ultimate_cron_multi_column_sort() funciton without 'sort' key in array $this->rows.
When open CRON Jobs showed notice and warnings:
Notice: Undefined index: sort in _ultimate_cron_multi_column_sort() (line 1705 of /path/to/project/sites/all/modules/ultimate_cron/ultimate_cron.module).
Warning: Invalid argument supplied for foreach() in _ultimate_cron_multi_column_sort() (line 1705 of /path/to/project/sites/all/modules/ultimate_cron/ultimate_cron.module).
For correction I use this code into _ultimate_cron_multi_column_sort() function:
if (!isset($a['sort']))
return 0;
Patch in attachment
Closed: outdated
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I'm closing this since Drupal 7 is now unsupported and there will be no more development on the Drupal 7 branch of Ultimate Cron either.
Thank you for taking the time and effort in reporting this issue, even though it never got resolved.