Warning: Invalid argument supplied for foreach() in includes/module.inc on line 1118

The following error happens when going to /admin/structure/features
It seems a lot of happening just from invoking rules_watchdog(), see below:

This happens on simple PHP Notice error:

watchdog( $type = 'php', $message = '%type: !message in %function (line %line of %file).', $variables = array ('%type' => 'Notice', '!message' => 'Undefined index: foo', '%function' => 'drupal_theme_initialize()', '%file' => 'includes/theme.inc', '%line' => 100, 'severity_level' => 5), $severity = 5, $link = ??? )

The problem is that this happens during drupal_theme_initialize(), so it's bad place to do rebuildEventCache(), especially from watchdog().