Set no title but title field still appears

This seems to be a problem in the link_field_process function. The settings array that is taken from form_state is not initialized.

Proposal for a fix:

//$settings = &$form_state['field'][$element['#field_name']][$element['#language']]['instance'
$instance = field_widget_instance($element, $form_state);
$settings = $instance['settings'];

I'm not able to reproduce - I created a node type, added a link field and selected the 'no title' option - I'm seeing no title field on the form. Can you give me some more information about the field that could help me reproduce your problem?

I'm getting this also. I am seeing it when I attach a link field to a profile2 content type. It appears it's due to how profile2 merges it's attached fields into profile forms. As a result, you can't guarantee a specific structure for $form_state['field'].

Based on the description of field_widget_instance() on api.d.o it looks like that's the proper way to get to field instance settings anyways. The change in #1 works for me.

Hm. I'll have to agree, it does look like I should be using field_widget_instance. Thank you for pointing that out.
I've pushed the change into git.

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Related issue: #1252274: Instance settings aren't saved for link fields attached to the user entity type

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