diff --git a/CHANGES.md b/CHANGES.md
index da4ee01..19c2e37 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,8 @@
 ### Changelog
 
+#### 0.2.1 (12/18/17)
+* Fixed: Output function breaks if Posts 2 Posts is not active.
+
 #### 0.2.0 (12/18/17)
 * Fixed: ACF field group not registered correctly.
 
diff --git a/README.md b/README.md
index 23d08d3..770d63c 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # Paginated Slideshows
 Create paginated slideshows that can easily be attached to one or more posts.
+
+Requires Advanced Custom Fields Pro and Posts 2 Posts plugins.
diff --git a/paginated-slideshows.php b/paginated-slideshows.php
index a904400..d3a3b7b 100644
--- a/paginated-slideshows.php
+++ b/paginated-slideshows.php
@@ -3,7 +3,7 @@
  * Plugin Name:        Paginated Slideshows
  * Plugin URI:         https://github.com/bizbudding/paginated-slideshows
  * Description:        Create paginated slideshows that can easily be attached to one or more posts.
- * Version:            0.2.0
+ * Version:            0.2.1
  *
  * Author:             BizBudding, Mike Hemberger
  * Author URI:         https://bizbudding.com
@@ -91,7 +91,7 @@ private function setup_constants() {
 
 		// Plugin version.
 		if ( ! defined( 'PAGINATED_SLIDESHOWS_VERSION' ) ) {
-			define( 'PAGINATED_SLIDESHOWS_VERSION', '0.2.0' );
+			define( 'PAGINATED_SLIDESHOWS_VERSION', '0.2.1' );
 		}
 
 		// Plugin Folder Path.
@@ -597,10 +597,17 @@ public function inline_styles() {
 
 	/**
 	 * Get a post's connected slideshow(s)
-	 * and
+	 * and display them.
+	 *
+	 * @return void
 	 */
 	public function create_pages( $post ) {
 
+		// Bail if Posts 2 Posts is not active.
+		if ( ! function_exists( 'p2p_type' ) ) {
+			return;
+		}
+
 		// Bail if not on a single post.
 		if ( ! is_singular( 'post' ) ) {
 			return;