diff --git a/src/Symfony/Component/Console/Input/ArgvInput.php b/src/Symfony/Component/Console/Input/ArgvInput.php
index 43cbe725fb..a6c2132797 100644
--- a/src/Symfony/Component/Console/Input/ArgvInput.php
+++ b/src/Symfony/Component/Console/Input/ArgvInput.php
@@ -215,8 +215,8 @@ class ArgvInput extends Input
 
         $option = $this->definition->getOption($name);
 
-        // Convert false values (from a previous call to substr()) to null
-        if (false === $value) {
+        // Convert empty values to null
+        if (!isset($value[0])) {
             $value = null;
         }
 
diff --git a/src/Symfony/Component/Debug/Tests/ErrorHandlerTest.php b/src/Symfony/Component/Debug/Tests/ErrorHandlerTest.php
index 563bd0997e..a3ab18f894 100644
--- a/src/Symfony/Component/Debug/Tests/ErrorHandlerTest.php
+++ b/src/Symfony/Component/Debug/Tests/ErrorHandlerTest.php
@@ -121,11 +121,11 @@ PHP
             $that->assertEquals('->', $trace[0]['type']);
 
             $that->assertEquals(__FILE__, $trace[1]['file']);
-            $that->assertEquals(__CLASS__, $trace[1]['class']);
+            $that->assertEquals('Symfony\Component\Debug\Tests\ErrorHandlerTest', $trace[1]['class']);
             $that->assertEquals('triggerNotice', $trace[1]['function']);
             $that->assertEquals('::', $trace[1]['type']);
 
-            $that->assertEquals(__CLASS__, $trace[2]['class']);
+            $that->assertEquals('Symfony\Component\Debug\Tests\ErrorHandlerTest', $trace[2]['class']);
             $that->assertEquals('testNotice', $trace[2]['function']);
             $that->assertEquals('->', $trace[2]['type']);
         };
diff --git a/src/Symfony/Component/Yaml/Parser.php b/src/Symfony/Component/Yaml/Parser.php
index fc46ab3caf..08cfac4224 100644
--- a/src/Symfony/Component/Yaml/Parser.php
+++ b/src/Symfony/Component/Yaml/Parser.php
@@ -320,7 +320,7 @@ class Parser
             return;
         }
 
-        if ($inSequence && $oldLineIndentation === $newIndent && '-' === $data[0][0]) {
+        if ($inSequence && $oldLineIndentation === $newIndent && isset($data[0][0]) && '-' === $data[0][0]) {
             // the previous line contained a dash but no item content, this line is a sequence item with the same indentation
             // and therefore no nested list or mapping
             $this->moveToPreviousLine();