[HttpKernel] private $traces property was not initialized to an empty array. When using the getLog() method to debug traces, it led to a warning in the apache error log.

hhamon · hhamon · commit facb67cbfadb · 2011-04-13T14:24:53.000+02:00
diff --git a/src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php b/src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php
@@ -91,6 +91,7 @@ public function __construct(HttpKernelInterface $kernel, StoreInterface $store,
             'stale_if_error'         => 60,
         ), $options);
         $this->esi = $esi;
+        $this->traces = array();
     }
 
     /**

Original file line number	Diff line number	Diff line change
`@@ -91,6 +91,7 @@ public function __construct(HttpKernelInterface $kernel, StoreInterface $store,`
`91`	`91`	`'stale_if_error' => 60,`
`92`	`92`	`), $options);`
`93`	`93`	`$this->esi = $esi;`
	`94`	`+ $this->traces = array();`
`94`	`95`	`}`
`95`	`96`
`96`	`97`	`/**`