Index: ammosreader/AmmosGlobalFrameHeader.py
===================================================================
--- ammosreader/AmmosGlobalFrameHeader.py	(revision 9951793d264049f6db3d966365bfe3782b41e43f)
+++ ammosreader/AmmosGlobalFrameHeader.py	(revision 57c81ef68096c9303c8c1b6e654ec52b40e8e753)
@@ -28,8 +28,7 @@
     def __init__(self, magic_word, frame_length, running_frame_number, frame_type, data_header_length, reserved):
 
-        if magic_word != self.MAGIC_WORD:
+        if magic_word != type(self).MAGIC_WORD:
             print("Wrong magic word")
             self.magic_word = magic_word
-            return None
         else:
             self.magic_word = magic_word