Undefined index: field api

Speculating, based on how this happens on my site:

I modified the function at line 725 to print the array if $key isn't a key in $array:

function facetapi_map_assoc(&$array, $name, $key) {
  if (array_key_exists($key,$array)) {
    $array[$key] = drupal_map_assoc($array[$key]);
  } else {
    print "<pre>";
    print_r ($array);
    print "</pre>";
  }
}

I was only getting this error after cron ran, so I ran cron and it spit out:

Array 
(
    [map options] => Array
        (
            [entities] => Array
                (
                    [0] => node
                    [1] => file
                )
        )
)

As you can see, 'field api bundles' is not an index; drupal_map_assoc can't make the associative array because the linear array doesn't exist. My guess is that this is occurring for me due to having recently installed the Apache SOLR Search Attachments module, which indexes files attached to nodes.

I removed the else statement from the code above and implemented this to keep the notice from appearing.

Same problem.

Also gives problems with facetapi_pretty_paths.

Related issue: https://www.drupal.org/node/2471563

I made a patch to dispose of this error, though you should note that it doesn't necessarily solve whatever is actually CAUSING the root issue. However, I stand by this since it's generally good practice to test your variables for existence/viability before trying to act on them. Please test.

I built against:
search_api_facetapi 7.x-1.22
facetapi 7.x-1.5+22-dev

I cannot reproduce this error. Maybe it's already gone. But yes, this checking can be added.

If anybody will face this problem again, let me know, please.

I cleaned up the patch in #4 so it only patches the module and not .htaccess as well. This allows for automated patching of the module.

One more try, cleanup the path on this one.

One more time. I missed one level of the path.

I don't think the maintainer included the update of the .htaccess file in his fix, see the corresponding commit (mentioned above): https://git.drupalcode.org/project/facetapi/commit/900bd713