diff --git a/src/Helpers/DataLinksHelper.php b/src/Helpers/DataLinksHelper.php
index 6f3358c..ce356d9 100644
--- a/src/Helpers/DataLinksHelper.php
+++ b/src/Helpers/DataLinksHelper.php
@@ -30,7 +30,7 @@ public static function setResponseDataLinks(array &$mappings, array &$value)
         $data = [];
         $type = $value[Serializer::CLASS_IDENTIFIER_KEY];
 
-        if (!empty($mappings[$type])) {
+        if (is_scalar($type) && !empty($mappings[$type])) {
             list($idValues, $idProperties) = RecursiveFormatterHelper::getIdPropertyAndValues($mappings, $value, $type);
             $selfLink = $mappings[$type]->getResourceUrl();
 
diff --git a/src/Helpers/PropertyHelper.php b/src/Helpers/PropertyHelper.php
index f0b9643..78fa3a2 100644
--- a/src/Helpers/PropertyHelper.php
+++ b/src/Helpers/PropertyHelper.php
@@ -28,6 +28,11 @@ final class PropertyHelper
     public static function setResponseDataTypeAndId(array &$mappings, array &$value)
     {
         $type = $value[Serializer::CLASS_IDENTIFIER_KEY];
+
+        if (!is_scalar($type)) {
+            return self::setResponseDataTypeAndId($mappings, $type);
+        }
+
         $finalType = ($mappings[$type]->getClassAlias()) ? $mappings[$type]->getClassAlias() : $type;
 
         $ids = [];
diff --git a/src/JsonApiTransformer.php b/src/JsonApiTransformer.php
index 667c998..386d0bb 100644
--- a/src/JsonApiTransformer.php
+++ b/src/JsonApiTransformer.php
@@ -121,10 +121,12 @@ private function removeTypeAndId(array $copy)
     {
         $type = $copy[Serializer::CLASS_IDENTIFIER_KEY];
 
-        foreach ($this->mappings[$type]->getIdProperties() as $propertyName) {
-            unset($copy[$propertyName]);
+        if (is_scalar($type)) {
+            foreach ($this->mappings[$type]->getIdProperties() as $propertyName) {
+                unset($copy[$propertyName]);
+            }
+            unset($copy[Serializer::CLASS_IDENTIFIER_KEY]);
         }
-        unset($copy[Serializer::CLASS_IDENTIFIER_KEY]);
 
         return $copy;
     }
@@ -137,18 +139,21 @@ protected function setResponseLinks(array $value, array &$data)
     {
         if (!empty($value[Serializer::CLASS_IDENTIFIER_KEY])) {
             $type = $value[Serializer::CLASS_IDENTIFIER_KEY];
-            $urls = $this->mappings[$type]->getUrls();
-
-            $data[self::LINKS_KEY] = array_filter(
-                array_merge(
-                    $this->addHrefToLinks($this->buildLinks()),
-                    (!empty($data[self::LINKS_KEY])) ? $data[self::LINKS_KEY] : [],
-                    (!empty($urls)) ? $this->addHrefToLinks($this->getResponseAdditionalLinks($value, $type)) : []
-                )
-            );
-
-            if (empty($data[self::LINKS_KEY])) {
-                unset($data[self::LINKS_KEY]);
+
+            if (is_scalar($type)) {
+                $urls = $this->mappings[$type]->getUrls();
+
+                $data[self::LINKS_KEY] = array_filter(
+                    array_merge(
+                        $this->addHrefToLinks($this->buildLinks()),
+                        (!empty($data[self::LINKS_KEY])) ? $data[self::LINKS_KEY] : [],
+                        (!empty($urls)) ? $this->addHrefToLinks($this->getResponseAdditionalLinks($value, $type)) : []
+                    )
+                );
+
+                if (empty($data[self::LINKS_KEY])) {
+                    unset($data[self::LINKS_KEY]);
+                }
             }
         }
     }
diff --git a/tests/Http/ResourceCreatedResponseTest.php b/tests/Http/ResourceCreatedResponseTest.php
index 5f93ebb..0bfee88 100644
--- a/tests/Http/ResourceCreatedResponseTest.php
+++ b/tests/Http/ResourceCreatedResponseTest.php
@@ -41,7 +41,7 @@ public function testResponseWithLocation()
         $this->assertEquals(['application/vnd.api+json'], $response->getHeader('Content-type'));
         $this->assertEquals(['http://example.com/photos/550e8400-e29b-41d4-a716-446655440000'], $response->getHeader('Location'));
     }
-    
+
     public function testResponse()
     {
         $json = json_encode([]);