--- a/program/lib/Roundcube/rcube_string_replacer.php	Sat Oct 18 12:24:31 2025 -0400
+++ b/program/lib/Roundcube/rcube_string_replacer.php	Sun Jan 18 14:20:29 2026 -0500
@@ -91,6 +91,8 @@
     {
         $i = -1;
         $scheme = strtolower($matches[1]);
+	$url_prefix = '';
+	$prefix = '';
 
         if (preg_match('!^(http|ftp|file)s?://!i', $scheme)) {
             $url = $matches[1] . $matches[2];
@@ -209,6 +211,8 @@
         // Yes, this is not perfect handles correctly only paired characters
         // but it should work for common cases
 
+      $suffix = '';
+
         if (preg_match('/(\\[|\\])/', $url)) {
             $in = false;
             for ($i=0, $len=strlen($url); $i<$len; $i++) {