diff --git a/backend/condition/parsing/factory.py b/backend/condition/parsing/factory.py
index c2963079..7db8383f 100644
--- a/backend/condition/parsing/factory.py
+++ b/backend/condition/parsing/factory.py
@@ -5,4 +5,6 @@ def select_parser(filepath: str) -> Parser:
     path = filepath.lower()
 
     if "lbwf" in path:
-        return LbwfParser()
\ No newline at end of file
+        return LbwfParser()
+
+    raise ValueError("Unrecognised file path, unable to instantiate Parser")
\ No newline at end of file