diff --git a/pdf_oralia/pages/charge.py b/pdf_oralia/pages/charge.py
index 190e5ff..4ebb6bd 100644
--- a/pdf_oralia/pages/charge.py
+++ b/pdf_oralia/pages/charge.py
@@ -32,7 +32,10 @@ def is_it(page_text):
 def get_lot(txt):
     """Return lot number from "RECAPITULATIF DES OPERATIONS" """
     regex = r"[BSM](\d+)(?=\s*-)"
-    result = re.findall(regex, txt)
+    try:
+        result = re.findall(regex, txt)
+    except TypeError:
+        return "*"
     if result:
         return "{:02d}".format(int(result[0]))
     return "*"