diff --git a/instruments/readers/filereader_registry.py b/instruments/readers/filereader_registry.py
index b620831..d0d9e7a 100644
--- a/instruments/readers/filereader_registry.py
+++ b/instruments/readers/filereader_registry.py
@@ -77,4 +77,4 @@ def select_file_reader(path):
         return file_readers[extension]
     
     # Default case if no reader is found
-    return None
\ No newline at end of file
+    return lambda x : None
\ No newline at end of file