implement extensions on existing objects

1 files changed, 1 insertions, 1 deletions

diff --git a/Digitigrade/Model/FetchableModel.php b/Digitigrade/Model/FetchableModel.php
index e14cc2e..6d21f40 100644
--- a/Digitigrade/Model/FetchableModel.php
+++ b/Digitigrade/Model/FetchableModel.php
@@ -38,7 +38,7 @@ abstract class FetchableModel extends Model implements RemoteFetchable {
             if (!($reflType instanceof \ReflectionNamedType))
                 continue;
             $type = $reflType->getName();
-            if (is_subclass_of($type, FetchableModel::class) && is_string($data->{$propName})) {
+            if (is_subclass_of($type, FetchableModel::class) && isset($data->{$propName}) && is_string($data->{$propName})) {
                 // try to avoid recursion
                 // TODO: make a better effort at avoiding recursion (e.g. when it's more than one step nested)
                 if ($data->{$propName} == $uri) {