From 8ae0682d3a35501c2d2eba3d4f9ca96e58654687 Mon Sep 17 00:00:00 2001
From: Toby Zerner <toby.zerner@gmail.com>
Date: Thu, 3 Oct 2019 16:19:56 +0930
Subject: [PATCH] Prevent error with empty relationships without links

---
 src/Serializer.php | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/Serializer.php b/src/Serializer.php
index d083b5a..d2cc350 100644
--- a/src/Serializer.php
+++ b/src/Serializer.php
@@ -88,7 +88,9 @@ final class Serializer
                 }
             }
 
-            $data['fields'][$name] = $value;
+            if (!empty($value)) {
+                $data['fields'][$name] = $value;
+            }
         }
 
         $data['links']['self'] = new SelfLink($resourceUrl);
@@ -175,11 +177,17 @@ final class Serializer
         );
     }
 
-    private function emptyRelationship(Relationship $field, string $resourceUrl): EmptyRelationship
+    private function emptyRelationship(Relationship $field, string $resourceUrl): ?EmptyRelationship
     {
+        $links = $this->getRelationshipLinks($field, $resourceUrl);
+
+        if (! $links) {
+            return null;
+        }
+
         return new EmptyRelationship(
             $field->getName(),
-            ...$this->getRelationshipLinks($field, $resourceUrl)
+            ...$links
         );
     }