Suppress Undefined property message in Core\Protocol

- Address https://github.com/friendica/friendica/issues/10755#issuecomment-979427147

diff --git a/src/Core/Protocol.php b/src/Core/Protocol.php
index bba7149a0462b848e4e3a6a101a2ec1f0256479a..3b3a29d071d24cfbef83b2b2cb2c0e34c5aaa5ed 100644 (file)
--- a/src/Core/Protocol.php
+++ b/src/Core/Protocol.php
@@ -176,7 +176,7 @@ class Protocol
                        $statusnet_user = $matches[2];
                        $UserData = DI::httpClient()->fetch('http://' . $statusnet_host . '/api/users/show.json?user_id=' . $statusnet_user);
                        $user = json_decode($UserData);
-                       if ($user) {
+                       if (!empty($user->screen_name)) {
                                $matches[2] = $user->screen_name;
                                return self::STATUSNET;
                        }