diff --git a/src/Protocol/PortableContact.php b/src/Protocol/PortableContact.php
index def8f1b628..a1e6f7e21c 100644
--- a/src/Protocol/PortableContact.php
+++ b/src/Protocol/PortableContact.php
@@ -720,7 +720,7 @@ class PortableContact
 
 		$server['register_policy'] = Register::CLOSED;
 
-		if (is_bool($nodeinfo['openRegistrations']) && $nodeinfo['openRegistrations']) {
+		if (isset($nodeinfo['openRegistrations']) && is_bool($nodeinfo['openRegistrations']) && $nodeinfo['openRegistrations']) {
 			$server['register_policy'] = Register::OPEN;
 		}