diff --git a/authhtpasswd.php b/authhtpasswd.php
index 18a6e56..d0f224e 100644
--- a/authhtpasswd.php
+++ b/authhtpasswd.php
@@ -36,7 +36,7 @@ class authhtpasswd extends auth
     foreach ($lines as $line)
     {
       // Comment line : skip it
-      if ($line{0} === "#")
+      if (isset ($line{0}) && $line{0} === "#")
         continue;
       $line = trim ($line);
       $user = strstr ($line, ":", true);