diff --git a/src/Symfony/Component/Form/FormRenderer.php b/src/Symfony/Component/Form/FormRenderer.php
index b286ffdf41..15a8d08430 100644
--- a/src/Symfony/Component/Form/FormRenderer.php
+++ b/src/Symfony/Component/Form/FormRenderer.php
@@ -253,10 +253,11 @@ class FormRenderer implements FormRendererInterface
 
         // Escape if no resource exists for this block
         if (!$resource) {
-            throw new LogicException(sprintf(
-                'Unable to render the form as none of the following blocks exist: "%s".',
-                implode('", "', array_reverse($blockNameHierarchy))
-            ));
+            if (count($blockNameHierarchy) !== count(array_unique($blockNameHierarchy))) {
+                throw new LogicException(sprintf('Unable to render the form because the block names array contains duplicates: "%s".', implode('", "', array_reverse($blockNameHierarchy))));
+            }
+
+            throw new LogicException(sprintf('Unable to render the form as none of the following blocks exist: "%s".', implode('", "', array_reverse($blockNameHierarchy))));
         }
 
         // Merge the passed with the existing attributes