diff --git a/fm_data_tasks/utils/data_utils.py b/fm_data_tasks/utils/data_utils.py
index a0f5baf..f48686b 100644
--- a/fm_data_tasks/utils/data_utils.py
+++ b/fm_data_tasks/utils/data_utils.py
@@ -33,7 +33,7 @@ def serialize_row(
         if str(row[c_og]) == "nan":
             row[c_og] = nan_tok
         else:
-            row[c_og] = f"{row[c_og].strip()}"
+            row[c_og] = f"{row[c_og]}".strip()
         res.append(f"{c_map}: {row[c_og]}".lstrip())
     if len(sep_tok) > 0 and sep_tok != ".":
         sep_tok = f" {sep_tok}"