diff --git a/program/lib/Roundcube/rcube_image.php b/program/lib/Roundcube/rcube_image.php
index c7a60e672..62dc5fa96 100644
--- a/program/lib/Roundcube/rcube_image.php
+++ b/program/lib/Roundcube/rcube_image.php
@@ -229,7 +229,7 @@ class rcube_image
                 $image = $new_image;
 
                 // fix rotation of image if EXIF data exists and specifies rotation (GD strips the EXIF data)
-                if (file_exists($this->image_file) ) {
+                if ($this->image_file && function_exists(exif_read_data) ) {
                     $exif = exif_read_data($this->image_file);
                     if ($exif && $exif['Orientation']) {
                         switch($exif['Orientation']) {