diff --git a/app/models/lettings_log.rb b/app/models/lettings_log.rb
index 79562045f..6491c100f 100644
--- a/app/models/lettings_log.rb
+++ b/app/models/lettings_log.rb
@@ -593,7 +593,7 @@ private
     self[postcode_known_key] = 1
     inferred_la = get_inferred_la(postcode)
     self[la_inferred_key] = inferred_la.present?
-    self[la_key] = inferred_la
+    self[la_key] = inferred_la if inferred_la.present?
   end
 
   def get_has_benefits
diff --git a/app/models/sales_log.rb b/app/models/sales_log.rb
index 0b4c901c7..90f130c04 100644
--- a/app/models/sales_log.rb
+++ b/app/models/sales_log.rb
@@ -207,7 +207,7 @@ class SalesLog < Log
     self[postcode_known_key] = 0
     inferred_la = get_inferred_la(postcode)
     self[la_inferred_key] = inferred_la.present?
-    self[la_key] = inferred_la
+    self[la_key] = inferred_la if inferred_la.present?
   end
 
   def outright_sale?