diff --git a/includes/revisions.php b/includes/revisions.php
index 4e50595c..5e9787e9 100644
--- a/includes/revisions.php
+++ b/includes/revisions.php
@@ -273,7 +273,7 @@ function wp_post_revision_field( $value, $field_name, $post = null, $direction =
 			}
 
 			// image
-			if ( $field['type'] == 'image' || $field['type'] == 'file' ) {
+			if ( $field &&($field['type'] == 'image' || $field['type'] == 'file' )) {
 
 				$url   = wp_get_attachment_url( $value );
 				$value = $value . ' (' . $url . ')';