diff --git a/Parsedown.php b/Parsedown.php
index ac83e50..5003775 100644
--- a/Parsedown.php
+++ b/Parsedown.php
@@ -584,13 +584,11 @@ class Parsedown
 
             return $Block;
         }
-        elseif ($Block['indent'] === $Line['indent'] and $placeholder = $this->blockList($Line))
+        elseif ($Block['indent'] === $Line['indent'] and $this->blockList($Line))
         {
             return null;
         }
 
-        unset($placeholder);
-
         if ($Line['text'][0] === '[' and $this->blockReference($Line))
         {
             return $Block;