diff --git a/0_KPI_functions.py b/0_KPI_functions.py
index fcdcbc6..519bcec 100644
--- a/0_KPI_functions.py
+++ b/0_KPI_functions.py
@@ -32,9 +32,8 @@ def campaigns_kpi_function(campaigns_information = None):
     campaigns_reduced = pd.merge(nb_campaigns, opened_campaign, on = 'customer_id', how = 'left')
     campaigns_reduced = pd.merge(campaigns_reduced, time_to_open, on = 'customer_id', how = 'left')
 
-    # Remplir les NaN : nb_campaigns_opened
-    campaigns_reduced['nb_campaigns_opened'].fillna(0)
-
+    # Fill NaN values
+    campaigns_reduced[['nb_campaigns', 'nb_campaigns_opened']] = campaigns_reduced[['nb_campaigns', 'nb_campaigns_opened']].fillna(0)
     # Remplir les NaT : time_to_open (??)
 
     return campaigns_reduced