diff --git a/root/usr/share/mozilla-mcd/thunderbird.php b/root/usr/share/mozilla-mcd/thunderbird.php
index 0abc945..80ac0e4 100644
--- a/root/usr/share/mozilla-mcd/thunderbird.php
+++ b/root/usr/share/mozilla-mcd/thunderbird.php
@@ -114,7 +114,9 @@ defaultPref("mail.imap.expunge_option", 3);
 defaultPref("mail.imap.expunge_threshold_number", 100);
 
 <?php
-foreach (glob("thunderbird.mod.*.php") as $filename){
-    require($filename);
+if (is_array(glob("thunderbird.mod.*.php"))){
+    foreach (glob("thunderbird.mod.*.php") as $filename){
+        require($filename);
+    }
 }
 ?>