diff --git a/src/abeautifulsite/SimpleImage.php b/src/abeautifulsite/SimpleImage.php
index 1064e9c..290010a 100644
--- a/src/abeautifulsite/SimpleImage.php
+++ b/src/abeautifulsite/SimpleImage.php
@@ -56,7 +56,7 @@ function __construct($filename = null, $width = null, $height = null, $color = n
      *
      */
     function __destruct() {
-        if ($this->image) {
+        if( get_resource_type($this->image) === 'gd' ) {
             imagedestroy($this->image);
         }
     }