Update app.py

app.py

@@ -107,6 +107,8 @@ def inference(file_name, _clear_punctuation_references, _clear_punctuation_predi
 
     df = pl.read_ndjson(file_name)
 
+    df = df.drop_nulls()
+
     required_columns = [
         "filename",
         "inference_start",