From 1eeecce4fd8274886eb2e6ab361f74cbba0e4da7 Mon Sep 17 00:00:00 2001
From: Michael Stilkerich <ms@mike2k.de>
Date: Fri, 22 Jan 2021 16:58:33 +0100
Subject: [PATCH] Fix null dereference error in param-filter

---
 lib/CardDAV/Plugin.php | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/CardDAV/Plugin.php b/lib/CardDAV/Plugin.php
index 09d1f593da..7097c8569b 100644
--- a/lib/CardDAV/Plugin.php
+++ b/lib/CardDAV/Plugin.php
@@ -587,7 +587,14 @@ protected function validateParamFilters(array $vProperties, array $filters, $tes
                 foreach ($vProperties as $vProperty) {
                     // If we got all the way here, we'll need to validate the
                     // text-match filter.
-                    $success = DAV\StringUtil::textMatch($vProperty[$filter['name']]->getValue(), $filter['text-match']['value'], $filter['text-match']['collation'], $filter['text-match']['match-type']);
+                    if (isset($vProperty[$filter['name']])) {
+                        $success = DAV\StringUtil::textMatch(
+                            $vProperty[$filter['name']]->getValue(),
+                            $filter['text-match']['value'],
+                            $filter['text-match']['collation'],
+                            $filter['text-match']['match-type']
+                        );
+                    }
                     if ($success) {
                         break;
                     }