From ab05609a5aa291a6f91b38dbb2800e3ac80a4f97 Mon Sep 17 00:00:00 2001
From: "Connor S. Parks" <ConnorVG@users.noreply.github.com>
Date: Mon, 24 Apr 2017 18:59:12 +0100
Subject: [PATCH] [5.4] Null Morph Map ErrorException (#18921)

* [5.4] Null Morph Map ErrorException

Currently, if you call `getActualClassNameForMorph` without the morph map set, it will through an error because `Relation::morphMap()` returns `null` instead of (what I would expect) `[]`.

Is this expected behaviour? If so, why is this expected behaviour?

* Create HasRelationships.php
---
 src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php b/src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php
index 038740b9fe81..703a3fccf3b1 100644
--- a/src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php
+++ b/src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php
@@ -192,7 +192,7 @@ protected function morphInstanceTo($target, $name, $type, $id)
      */
     public static function getActualClassNameForMorph($class)
     {
-        return Arr::get(Relation::morphMap(), $class, $class);
+        return Arr::get(Relation::morphMap() ?: [], $class, $class);
     }
 
     /**