diff --git a/lambdas/wo/web_ui/handler.py b/lambdas/wo/web_ui/handler.py
index 4168942..f8bb0a5 100644
--- a/lambdas/wo/web_ui/handler.py
+++ b/lambdas/wo/web_ui/handler.py
@@ -40,6 +40,8 @@ def get_comments(work_order_id):
 
 
 def render_badge(value, color_map):
+    if not value:
+        value = "unknown"
     color = color_map.get(value, "#9ca3af")
     label = esc(value.replace("_", " ").title())
     return f'<span style="background:{color};color:#fff;padding:2px 10px;border-radius:12px;font-size:12px;font-weight:500;">{label}</span>'
@@ -163,7 +165,7 @@ def render_work_orders_list(work_orders):
         status = wo.get("wo_status", "unknown")
         record_type = wo.get("record_type", "unknown")
         due = esc(wo.get("due_date", ""))
-        updated = esc(wo.get("updated_at", "")[:16])
+        updated = esc((wo.get("updated_at") or "")[:16])
 
         rows += f"""
         <tr style="border-bottom:1px solid #f1f5f9;cursor:pointer;" onclick="window.location='/wo?id={wo_id}'">
diff --git a/scripts/backfill_sites.py b/scripts/backfill_sites.py
index 121d5ca..f2b9909 100644
--- a/scripts/backfill_sites.py
+++ b/scripts/backfill_sites.py
@@ -8,7 +8,7 @@ Usage:
 import sys
 import os
 
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "lambdas", "site_extractor"))
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "lambdas", "po", "site_extractor"))
 
 import boto3
 from handler import extract_site_code, parse_address, upsert_site