--- captcha.module.orig	2004-11-05 22:37:32.094398424 -0600
+++ captcha.module	2004-11-05 22:42:10.243113392 -0600
@@ -25,8 +25,11 @@
 function captcha_cron() {
 
   //Clean up old images
-  foreach (glob(variable_get("captcha_image_path", "")."/captcha*.png") as $filename) {
-     unlink($filename);
+  $files = glob(variable_get("captcha_image_path", "")."/captcha*.png");
+  if ( $files ) {
+    foreach ($files as $filename) {
+       unlink($filename);
+    }
   }
 
 }