diff --git a/src/Symfony/Component/DomCrawler/FormFieldRegistry.php b/src/Symfony/Component/DomCrawler/FormFieldRegistry.php
index 5144ac739c..677a9aad31 100644
--- a/src/Symfony/Component/DomCrawler/FormFieldRegistry.php
+++ b/src/Symfony/Component/DomCrawler/FormFieldRegistry.php
@@ -204,8 +204,12 @@ class FormFieldRegistry
     {
         if (preg_match('/^(?P<base>[^[]+)(?P<extra>(\[.*)|$)/', $name, $m)) {
             $segments = array($m['base']);
-            while (preg_match('/^\[(?P<segment>.*?)\](?P<extra>.*)$/', $m['extra'], $m)) {
-                $segments[] = $m['segment'];
+            while (!empty($m['extra'])) {
+                if (preg_match('/^\[(?P<segment>.*?)\](?P<extra>.*)$/', $m['extra'], $m)) {
+                    $segments[] = $m['segment'];
+                } else {
+                    throw new \InvalidArgumentException(sprintf('Malformed field path "%s"', $name));
+                }
             }
 
             return $segments;
diff --git a/src/Symfony/Component/DomCrawler/Tests/FormTest.php b/src/Symfony/Component/DomCrawler/Tests/FormTest.php
index 93841e59c2..15af5a24ea 100644
--- a/src/Symfony/Component/DomCrawler/Tests/FormTest.php
+++ b/src/Symfony/Component/DomCrawler/Tests/FormTest.php
@@ -247,6 +247,18 @@ class FormTest extends \PHPUnit_Framework_TestCase
         }
     }
 
+    public function testSetValueOnMultiValuedFieldsWithMalformedName()
+    {
+        $form = $this->createForm('<form><input type="text" name="foo[bar]" value="bar" /><input type="text" name="foo[baz]" value="baz" /><input type="submit" /></form>');
+
+        try {
+            $form['foo[bar'] = 'bar';
+            $this->fail('->offsetSet() throws an \InvalidArgumentException exception if the name is malformed.');
+        } catch (\InvalidArgumentException $e) {
+            $this->assertTrue(true, '->offsetSet() throws an \InvalidArgumentException exception if the name is malformed.');
+        }
+    }
+
     public function testOffsetUnset()
     {
         $form = $this->createForm('<form><input type="text" name="foo" value="foo" /><input type="submit" /></form>');