advanced_help_form_system_modules_alter assumes that the modules page is being displayed and that $form['modules'] exists.
When enabling the module with other modules that have dependencies, the interim page telling you want dependencies will be installed gives a warning.
This can be fixed with

function advanced_help_form_system_modules_alter(&$form, &$form_state) {
  if (empty($form['modules'])) return;
  ...
}

Comments

gisle’s picture

Issue summary: View changes
Status: Active » Closed (works as designed)

It alredy fixed in latest dev snapshot. Reported twice?