diff --git a/classes/ComicPressAdmin.inc b/classes/ComicPressAdmin.inc
index b223114..a9a5e2e 100644
--- a/classes/ComicPressAdmin.inc
+++ b/classes/ComicPressAdmin.inc
@@ -215,8 +215,10 @@ class ComicPressAdmin {
     foreach ($_POST['attachments'] as $post_id => $settings) {
       if (isset($settings['comicpress_management'])) {
         $media_post = get_post($post_id);
-        $media_post->post_parent = $settings['post_parent'];
-        wp_update_post($media_post);
+        if (isset($media_post->post_parent)) { 
+          $media_post->post_parent = $settings['post_parent'];
+          wp_update_post($media_post);
+        }
       }
       update_post_meta($post_id, 'comicpress', array(
         'managed' => isset($settings['comicpress_management']
diff --git a/classes/ComicPressStoryline.inc b/classes/ComicPressStoryline.inc
index 0ad8bce..d68f5e8 100644
--- a/classes/ComicPressStoryline.inc
+++ b/classes/ComicPressStoryline.inc
@@ -156,13 +156,16 @@ class ComicPressStoryline {
   	if (isset($this->_structure[$id])) {
   		$all_adjacent = array();
   		do {
-        $new_id = $this->_structure[$id][$direction];
-        
         $has_adjacent = false;
-        if (!in_array($new_id, $all_adjacent)) {
-          if ($has_adjacent = isset($this->_structure[$id][$direction])) {
-            $all_adjacent[] = $new_id;
-            $id = $new_id;
+
+        if (isset($this->_structure[$id][$direction])) {
+          $new_id = $this->_structure[$id][$direction];
+
+          if (!in_array($new_id, $all_adjacent)) {
+            if ($has_adjacent = isset($this->_structure[$id][$direction])) {
+              $all_adjacent[] = $new_id;
+              $id = $new_id;
+            }
           }
         }
   		} while ($has_adjacent);
diff --git a/classes/backends/ComicPressBackendAttachment.inc b/classes/backends/ComicPressBackendAttachment.inc
index 5bed84f..e1f25f6 100644
--- a/classes/backends/ComicPressBackendAttachment.inc
+++ b/classes/backends/ComicPressBackendAttachment.inc
@@ -18,8 +18,10 @@ class ComicPressBackendAttachment extends ComicPressBackend {
 		    if (!empty($children)) {
 		    	foreach ($children as $child) {
             $meta = get_post_meta($child->ID, 'comicpress', true);
-            if ($meta['managed']) {
-              $result[] = new ComicPressBackendAttachment($child);
+            if (isset($meta['managed'])) {
+              if ($meta['managed']) {
+                $result[] = new ComicPressBackendAttachment($child);
+              }
             }
 		    	}
 		    }
diff --git a/phpunit.xml b/phpunit.xml
index 11fbdd5..97e1e24 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,2 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit colors="true" bootstrap="test/bootstrap.php" />
\ No newline at end of file
+<phpunit colors="true" bootstrap="test/bootstrap.php">
+  <php>
+    <ini name="error_reporting" value="30719" />
+  </php>
+</phpunit>
\ No newline at end of file