diff --git a/src/Symfony/Component/HttpKernel/Debug/ErrorHandler.php b/src/Symfony/Component/HttpKernel/Debug/ErrorHandler.php
index 07a80772d6..f6b5585c84 100644
--- a/src/Symfony/Component/HttpKernel/Debug/ErrorHandler.php
+++ b/src/Symfony/Component/HttpKernel/Debug/ErrorHandler.php
@@ -119,7 +119,7 @@ class ErrorHandler
             return;
         }
 
-        unset($this->reservedMemory);
+        $this->reservedMemory = '';
         $type = $error['type'];
         if (0 === $this->level || !in_array($type, array(E_ERROR, E_CORE_ERROR, E_COMPILE_ERROR, E_PARSE))) {
             return;
diff --git a/src/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php b/src/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php
index 43dfaff5c5..30d4011ffe 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php
@@ -136,7 +136,7 @@ class ProfilerListener implements EventSubscriberInterface
         if ($master) {
             $this->saveProfiles($profile);
 
-            unset($this->children);
+            $this->children = new \SplObjectStorage();
         }
     }