Fatal error when deleting a taxonomy

Hello

I did not reproduce the issue with a clean install of platform. The value of $form['name']['#type'] is still 'value'.
Do you have a custom or contrib module that would change this value before passing in the xmlsitemap_taxonomy code?

In any case, I think the more secure way is follow the logic implemented in the taxonomy module because if we change the value of $form['name']['#type'], there is nothing preventing to do so for $form['delete']['#type']; after all, only the '#value' is important for the process.

In 'taxonomy.admin.inc', line 674 of taxonomy_form_term(), to detect that we are in the delete confirm form case, the test is:

  // Check for confirmation forms.
  if (isset($form_state['confirm_delete'])) {
    return array_merge($form, taxonomy_term_confirm_delete($form, $form_state, $term->tid));
  }

Then, we should have the same logic in xmlsitemap_taxonomy_form_taxonomy_form_term_alter():

  if (isset($form_state['confirm_delete']) {
    // If this is the delete form, do not add our form elements.
    return;
  }

Other parameters can be changed but this one cannot without breaking the taxonomy term form.

I push here a patch in this direction.