--- a/program/lib/Roundcube/rcube_vcard.php	Fri Oct 17 17:31:22 2025 -0400
+++ b/program/lib/Roundcube/rcube_vcard.php	Sat Oct 18 12:24:31 2025 -0400
@@ -647,7 +647,7 @@
 
                 foreach ($regs2[1] as $attrid => $attr) {
                     $attr = preg_replace('/[\s\t\n\r\0\x0B]/', '', $attr);
-                    if ((list($key, $value) = explode('=', $attr)) && $value) {
+                    if ((@list($key, $value) = explode('=', $attr)) && $value) {
                         if ($key == 'ENCODING') {
                             $value = strtoupper($value);
                             // add next line(s) to value string if QP line end detected
@@ -660,7 +660,7 @@
                         }
                         else {
                             $lc_key = strtolower($key);
-                            $entry[$lc_key] = array_merge((array)$entry[$lc_key], (array)self::vcard_unquote($value, ','));
+                            $entry[$lc_key] = array_merge((array)($entry[$lc_key]??null), (array)self::vcard_unquote($value, ','));
                         }
                     }
                     else if ($attrid > 0) {