diff --git a/src/Symfony/Component/Yaml/Parser.php b/src/Symfony/Component/Yaml/Parser.php
index 52dedfe078..a37e3e6948 100644
--- a/src/Symfony/Component/Yaml/Parser.php
+++ b/src/Symfony/Component/Yaml/Parser.php
@@ -303,7 +303,11 @@ class Parser
     private function getNextEmbedBlock($indentation = null, $inSequence = false)
     {
         $oldLineIndentation = $this->getCurrentLineIndentation();
-        $insideBlockScalar = $this->isBlockScalarHeader();
+        $blockScalarIndentations = array();
+
+        if ($this->isBlockScalarHeader()) {
+            $blockScalarIndentations[] = $this->getCurrentLineIndentation();
+        }
 
         if (!$this->moveToNextLine()) {
             return;
@@ -340,8 +344,8 @@ class Parser
 
         $isItUnindentedCollection = $this->isStringUnIndentedCollectionItem();
 
-        if (!$insideBlockScalar) {
-            $insideBlockScalar = $this->isBlockScalarHeader();
+        if (empty($blockScalarIndentations) && $this->isBlockScalarHeader()) {
+            $blockScalarIndentations[] = $this->getCurrentLineIndentation();
         }
 
         $previousLineIndentation = $this->getCurrentLineIndentation();
@@ -349,8 +353,17 @@ class Parser
         while ($this->moveToNextLine()) {
             $indent = $this->getCurrentLineIndentation();
 
-            if (!$insideBlockScalar && $indent === $previousLineIndentation) {
-                $insideBlockScalar = $this->isBlockScalarHeader();
+            // terminate all block scalars that are more indented than the current line
+            if (!empty($blockScalarIndentations) && $indent < $previousLineIndentation && trim($this->currentLine) !== '') {
+                foreach ($blockScalarIndentations as $key => $blockScalarIndentation) {
+                    if ($blockScalarIndentation >= $this->getCurrentLineIndentation()) {
+                        unset($blockScalarIndentations[$key]);
+                    }
+                }
+            }
+
+            if (empty($blockScalarIndentations) && !$this->isCurrentLineComment() && $this->isBlockScalarHeader()) {
+                $blockScalarIndentations[] = $this->getCurrentLineIndentation();
             }
 
             $previousLineIndentation = $indent;
@@ -366,7 +379,7 @@ class Parser
             }
 
             // we ignore "comment" lines only when we are not inside a scalar block
-            if (!$insideBlockScalar && $this->isCurrentLineComment()) {
+            if (empty($blockScalarIndentations) && $this->isCurrentLineComment()) {
                 continue;
             }
 
@@ -523,7 +536,7 @@ class Parser
             $previousLineIndented = false;
             $previousLineBlank = false;
 
-            for ($i = 0; $i < count($blockLines); $i++) {
+            for ($i = 0; $i < count($blockLines); ++$i) {
                 if ('' === $blockLines[$i]) {
                     $text .= "\n";
                     $previousLineIndented = false;
@@ -618,7 +631,7 @@ class Parser
         //checking explicitly the first char of the trim is faster than loops or strpos
         $ltrimmedLine = ltrim($this->currentLine, ' ');
 
-        return $ltrimmedLine[0] === '#';
+        return '' !== $ltrimmedLine && $ltrimmedLine[0] === '#';
     }
 
     /**
diff --git a/src/Symfony/Component/Yaml/Tests/ParserTest.php b/src/Symfony/Component/Yaml/Tests/ParserTest.php
index 7a1485eb2d..9d6d42befe 100644
--- a/src/Symfony/Component/Yaml/Tests/ParserTest.php
+++ b/src/Symfony/Component/Yaml/Tests/ParserTest.php
@@ -737,7 +737,9 @@ EOF;
 
     public function getCommentLikeStringInScalarBlockData()
     {
-        $yaml1 = <<<'EOT'
+        $tests = array();
+
+        $yaml = <<<'EOT'
 pages:
     -
         title: some title
@@ -752,7 +754,7 @@ pages:
 
             footer # comment3
 EOT;
-        $expected1 = array(
+        $expected = array(
             'pages' => array(
                 array(
                     'title' => 'some title',
@@ -771,8 +773,9 @@ EOT
                 ),
             ),
         );
+        $tests[] = array($yaml, $expected);
 
-        $yaml2 = <<<'EOT'
+        $yaml = <<<'EOT'
 test: |
     foo
     # bar
@@ -787,7 +790,7 @@ collection:
         # bar
         baz
 EOT;
-        $expected2 = array(
+        $expected = array(
             'test' => <<<'EOT'
 foo
 # bar
@@ -814,11 +817,47 @@ EOT
                 ),
             ),
         );
+        $tests[] = array($yaml, $expected);
 
-        return array(
-            array($yaml1, $expected1),
-            array($yaml2, $expected2),
+        $yaml = <<<EOT
+foo:
+  bar:
+    scalar-block: >
+      line1
+      line2>
+  baz:
+# comment
+    foobar: ~
+EOT;
+        $expected = array(
+            'foo' => array(
+                'bar' => array(
+                    'scalar-block' => 'line1 line2>',
+                ),
+                'baz' => array(
+                    'foobar' => null,
+                ),
+            ),
         );
+        $tests[] = array($yaml, $expected);
+
+        $yaml = <<<'EOT'
+a:
+    b: hello
+#    c: |
+#        first row
+#        second row
+    d: hello
+EOT;
+        $expected = array(
+            'a' => array(
+                'b' => 'hello',
+                'd' => 'hello',
+            ),
+        );
+        $tests[] = array($yaml, $expected);
+
+        return $tests;
     }
 
     public function testBlankLinesAreParsedAsNewLinesInFoldedBlocks()