diff --git a/wsgi.py b/wsgi.py
index f06c6e3..60d4958 100644
--- a/wsgi.py
+++ b/wsgi.py
@@ -83,6 +83,9 @@ def plot(
         sum_val = current_df[["Digitale Befragung"]].sum().iloc[0]
         df.loc[curr_datetime] = sum_val
 
+        if pd.isna(df.loc[df.index.max()][0]):
+            df = df.drop([df.index.max()])
+
     fig = plt.figure(dpi=300)
 
     # fill weekends