handling NaN values

app.py

@@ -53,8 +53,8 @@ df["username"] = df.author.apply(lambda x: x["name"])
 df["totalReactions"] = df.reactions.apply(lambda x: sum([_["count"] for _ in x]))
 df["Num of posts"] = 1
 
-# Ensure metrics columns are integers
-df[metrics] = df[metrics].astype(int)
+# Ensure metrics columns are integers, handling NaN values
+df[metrics] = df[metrics].fillna(0).astype(int)
 
 data = (
     df.groupby(["username", "Name"])[metrics]