taxonomy_image_display gives 500 error

Can't get this module to work, I'm afraid - if I put taxonomy_image_display into a PHP field in my view, I just get errors.

I have a page view that lists all items in a given taxonomy in a grid, but I want to make the image a link to a Node form and carry through fields from a previous view. I have added an image field to the taxonomy and I can get the images to display just fine - so I know the taxonomy data retrieval is working. If I play with the "available variables" I can get it to show the taxonomy term ID and/or image ID, but a call to taxonomy_image_display($row->tid); just causes a 500 error.

Incidentally, if you want to see how I'm currently extracting the image:

if (isset($data->_field_data['tid']['entity'])) {
  $entity=$data->_field_data['tid']['entity'];
  if (isset($entity->field_photo['und'][0])) {
    $field_photo=$entity->field_photo['und'][0];
    $imageFilename=$field_photo['filename'];
    echo "<img src=\"sites/default/files/styles/medium/public/".$imageFilename."\" title=\"choose\" />";
  } else {
    # no image for this taxonomy entry
    echo "<img src=\"sites/default/files/select.png\" title=\"choose\" />";
  }
} else {
  echo "ERROR: missing entity!"; # unlikely
}

Unfortunately this method only returns the actual filename so I'm having to assume the path.

Versions:

• Drupal core - 7.19
• Entity Reference - 7.x-1.0
• Taxonomy Image - 7.x-1.x-dev
• Views - 7.x-3.5
• Views Calc - 7.x-1.0
• Views PHP - 7.x-1.x-dev