diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/collectors.xml b/src/Symfony/Bundle/FrameworkBundle/Resources/config/collectors.xml
index bc53294a1bfe..28e0a606eda7 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/collectors.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/collectors.xml
@@ -18,7 +18,7 @@
     <services>
         <service id="data_collector.config" class="%data_collector.config.class%" public="false">
             <tag name="data_collector" template="WebProfilerBundle:Collector:config" id="config" priority="255" />
-            <call method="setKernel"><argument type="service" id="kernel" /></call>
+            <call method="setKernel"><argument type="service" id="kernel" on-invalid="ignore" /></call>
         </service>
 
         <service id="data_collector.request" class="%data_collector.request.class%">
@@ -42,7 +42,7 @@
 
         <service id="data_collector.time" class="%data_collector.time.class%" public="false">
             <tag name="data_collector" template="WebProfilerBundle:Collector:time" id="time" priority="255" />
-            <argument type="service" id="kernel" />
+            <argument type="service" id="kernel" on-invalid="ignore" />
         </service>
 
         <service id="data_collector.memory" class="%data_collector.memory.class%" public="false">
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
index 97797a48f23b..cfaa0b7277b0 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
@@ -31,7 +31,7 @@ class ConfigDataCollector extends DataCollector
      *
      * @param KernelInterface $kernel A KernelInterface instance
      */
-    public function setKernel(KernelInterface $kernel)
+    public function setKernel(KernelInterface $kernel = null)
     {
         $this->kernel = $kernel;
     }