diff --git a/class-twicpics-api.php b/class-twicpics-api.php
index cd98b3a..c62d94f 100644
--- a/class-twicpics-api.php
+++ b/class-twicpics-api.php
@@ -152,7 +152,7 @@ public function image_attributes( $attributes ) {
 		}
 
 		if ( ! $this->is_on_same_domain( $img_src ) ) {
-			return;
+			return $attributes;
 		}
 
 		/* TwicPics src*/
diff --git a/class-twicpics-script.php b/class-twicpics-script.php
index bc4d90b..79c7b1c 100644
--- a/class-twicpics-script.php
+++ b/class-twicpics-script.php
@@ -230,7 +230,7 @@ public function image_attributes( $attributes ) {
 		}
 
 		if ( ! $this->is_on_same_domain( $img_url ) ) {
-			return;
+			return $attributes;
 		}
 
 		$attributes['data-twic-src'] = $this->_urls_manager->get_original_size_url( $img_url );