diff --git a/modules/image/image.field.inc b/modules/image/image.field.inc
index 1be15839ced47e29cdd5d7463bbda552da87cb98..60c0f5ac00ff2e0e3bf20dae85a54020ee68b8b0 100644
--- a/modules/image/image.field.inc
+++ b/modules/image/image.field.inc
@@ -600,9 +600,12 @@ function theme_image_formatter($variables) {
   $item = $variables['item'];
   $image = array(
     'path' => $item['uri'],
-    'alt' => $item['alt'],
   );
 
+  if (array_key_exists('alt', $item)) {
+    $image['alt'] = $item['alt'];
+  }
+
   if (isset($item['attributes'])) {
     $image['attributes'] = $item['attributes'];
   }
@@ -613,7 +616,7 @@ function theme_image_formatter($variables) {
   }
 
   // Do not output an empty 'title' attribute.
-  if (drupal_strlen($item['title']) > 0) {
+  if (isset($item['title']) && drupal_strlen($item['title']) > 0) {
     $image['title'] = $item['title'];
   }
 
@@ -625,9 +628,11 @@ function theme_image_formatter($variables) {
     $output = theme('image', $image);
   }
 
-  if (!empty($variables['path']['path'])) {
+  // The link path and link options are both optional, but for the options to be
+  // processed, the link path must at least be an empty string.
+  if (isset($variables['path']['path'])) {
     $path = $variables['path']['path'];
-    $options = $variables['path']['options'];
+    $options = isset($variables['path']['options']) ? $variables['path']['options'] : array();
     // When displaying an image inside a link, the html option must be TRUE.
     $options['html'] = TRUE;
     $output = l($output, $path, $options);
diff --git a/modules/image/image.test b/modules/image/image.test
index 2a3559981d1b77d0a6ced55fbdbccede63e15c40..1ca8465067364dceec836e6f8080a41ddd1e1981 100644
--- a/modules/image/image.test
+++ b/modules/image/image.test
@@ -1597,3 +1597,64 @@ class ImageFieldDefaultImagesTestCase extends ImageFieldTestCase {
   }
 
 }
+
+/**
+ * Tests image theme functions.
+ */
+class ImageThemeFunctionWebTestCase extends DrupalWebTestCase {
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Image theme functions',
+      'description' => 'Test that the image theme functions work correctly.',
+      'group' => 'Image',
+    );
+  }
+
+  function setUp() {
+    parent::setUp(array('image'));
+  }
+
+  /**
+   * Tests usage of the image field formatters.
+   */
+  function testImageFormatterTheme() {
+    // Create an image.
+    $files = $this->drupalGetTestFiles('image');
+    $file = reset($files);
+    $original_uri = file_unmanaged_copy($file->uri, 'public://', FILE_EXISTS_RENAME);
+
+    // Create a style.
+    image_style_save(array('name' => 'test'));
+    $url = image_style_url('test', $original_uri);
+
+    // Test using theme_image_formatter() without an image title, alt text, or
+    // link options.
+    $path = $this->randomName();
+    $element = array(
+      '#theme' => 'image_formatter',
+      '#image_style' => 'test',
+      '#item' => array(
+        'uri' => $original_uri,
+      ),
+      '#path' => array(
+        'path' => $path,
+      ),
+    );
+    $rendered_element = render($element);
+    $expected_result = '<a href="' . url($path) . '"><img typeof="foaf:Image" src="' . $url . '" alt="" /></a>';
+    $this->assertEqual($expected_result, $rendered_element, 'theme_image_formatter() correctly renders without title, alt, or path options.');
+
+    // Link the image to a fragment on the page, and not a full URL.
+    $fragment = $this->randomName();
+    $element['#path']['path'] = '';
+    $element['#path']['options'] = array(
+      'external' => TRUE,
+      'fragment' => $fragment,
+    );
+    $rendered_element = render($element);
+    $expected_result = '<a href="#' . $fragment . '"><img typeof="foaf:Image" src="' . $url . '" alt="" /></a>';
+    $this->assertEqual($expected_result, $rendered_element, 'theme_image_formatter() correctly renders a link fragment.');
+  }
+
+}