For PHP 7.2, adapted for version 5.4.3 from 

From ecab701e7de49f160d83be6a42d6c5aa9a8df76b Mon Sep 17 00:00:00 2001
From: Matthieu Napoli <matthieu@mnapoli.fr>
Date: Sun, 4 Jun 2017 17:11:16 +0200
Subject: [PATCH] Fix the build on PHP 7.2

---
 src/Container.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Container.php b/src/Container.php
index d7e87585..b445aa89 100644
--- a/src/DI/Container.php
+++ b/src/DI/Container.php
@@ -211,6 +211,10 @@ public function has($name)
      */
     public function injectOn($instance)
     {
+        if (!$instance) {
+            return $instance;
+        }
+
         $objectDefinition = $this->definitionSource->getDefinition(get_class($instance));
         if (! $objectDefinition instanceof ObjectDefinition) {
             return $instance;