diff --git a/cron/reports.py b/cron/reports.py
index aed063b..6c635d3 100644
--- a/cron/reports.py
+++ b/cron/reports.py
@@ -152,7 +152,7 @@ def get_muster_roll(cosec_creds: dict):
             "Grade Name", "Branch Name", "Department Name",
             "Direct Reporting", "Level-1"
         ]]
-        report_data.where(report_data.notna(), None)
+        report_data = report_data.where(report_data.notna(), None)
         report_data = report_data.to_dict(orient = "records")
 
         # Save the data to a JSON file: