diff --git a/src/Symfony/Component/Console/Helper/QuestionHelper.php b/src/Symfony/Component/Console/Helper/QuestionHelper.php
index 7ac2afa0ac..0500b415e6 100644
--- a/src/Symfony/Component/Console/Helper/QuestionHelper.php
+++ b/src/Symfony/Component/Console/Helper/QuestionHelper.php
@@ -212,7 +212,7 @@ class QuestionHelper extends Helper
                 $c .= fread($inputStream, 2);
 
                 // A = Up Arrow. B = Down Arrow
-                if ('A' === $c[2] || 'B' === $c[2]) {
+                if (isset($c[2]) && ('A' === $c[2] || 'B' === $c[2])) {
                     if ('A' === $c[2] && -1 === $ofs) {
                         $ofs = 0;
                     }