diff --git a/notes_tools/tools/df_marks_manip.py b/notes_tools/tools/df_marks_manip.py
index 379f608..bb72431 100644
--- a/notes_tools/tools/df_marks_manip.py
+++ b/notes_tools/tools/df_marks_manip.py
@@ -479,10 +479,6 @@ def digest_flat_df(flat_df):
     """
     df = flat_df.dropna(subset=["Note"])
 
-    df["Question"].fillna("", inplace = True)
-    df["Exercice"].fillna("", inplace = True)
-    df["Domaine"].fillna("", inplace = True)
-    df["Competence"].fillna("", inplace = True)
     df["Mark"] = compute_marks(df)
     df["Level"] = compute_level(df)
     df["Latex_rep"] = compute_latex_rep(df)