diff --git a/src/PelFormat.php b/src/PelFormat.php
index 27c7cdfb..d50354c7 100644
--- a/src/PelFormat.php
+++ b/src/PelFormat.php
@@ -17,6 +17,13 @@
  */
 class PelFormat
 {
+    /**
+     * ERROR Handling
+     * FIX Unknown format: 0x0
+     * @author Agamemnon Katradis https://github.com/agaktr/
+     */
+    const ERROR = 0;
+
     /**
      * Unsigned byte.
      *
@@ -149,6 +156,7 @@ class PelFormat
         self::FLOAT => 'Float',
         self::DOUBLE => 'Double',
         self::UNDEFINED => 'Undefined',
+        self::ERROR => 'ERROR'
     ];
 
     /**
@@ -167,6 +175,7 @@ class PelFormat
         self::FLOAT => 4,
         self::DOUBLE => 8,
         self::UNDEFINED => 1,
+        self::ERROR => 0,
     ];
 
     /**