diff --git a/app/models/log.rb b/app/models/log.rb
index d99399da1..e15869634 100644
--- a/app/models/log.rb
+++ b/app/models/log.rb
@@ -179,6 +179,7 @@ class Log < ApplicationRecord
 
   def blank_compound_invalid_non_setup_fields!
     self.ppcodenk = nil if errors.attribute_names.include? :ppostcode_full
+    self.previous_la_known = nil if errors.attribute_names.include? :prevloc
 
     if errors.of_kind?(:uprn, :uprn_error)
       self.uprn_known = nil
diff --git a/spec/models/lettings_log_spec.rb b/spec/models/lettings_log_spec.rb
index 5c55d87cb..f27a7f7e5 100644
--- a/spec/models/lettings_log_spec.rb
+++ b/spec/models/lettings_log_spec.rb
@@ -3382,26 +3382,6 @@ RSpec.describe LettingsLog do
     end
   end
 
-  describe "#blank_invalid_non_setup_fields!" do
-    context "when a setup field is invalid" do
-      subject(:model) { described_class.new(needstype: 404) }
-
-      it "does not blank it" do
-        model.valid?
-        expect { model.blank_invalid_non_setup_fields! }.not_to change(model, :needstype)
-      end
-    end
-
-    context "when a non setup field is invalid" do
-      subject(:model) { build(:lettings_log, :completed, offered: 234) }
-
-      it "blanks it" do
-        model.valid?
-        expect { model.blank_invalid_non_setup_fields! }.to change(model, :offered)
-      end
-    end
-  end
-
   describe "#beds_for_la_rent_range" do
     context "when beds nil" do
       let(:lettings_log) { build(:lettings_log, beds: nil) }
diff --git a/spec/models/log_spec.rb b/spec/models/log_spec.rb
index fb686e744..3494f152f 100644
--- a/spec/models/log_spec.rb
+++ b/spec/models/log_spec.rb
@@ -27,4 +27,54 @@ RSpec.describe Log, type: :model do
       expect(in_progress_lettings_log.calculate_status).to eq "in_progress"
     end
   end
+
+  describe "#blank_invalid_non_setup_fields!" do
+    context "when a setup field is invalid for a lettings log" do
+      subject(:model) { build(:lettings_log, needstype: 404) }
+
+      it "does not blank it" do
+        model.valid?
+        expect { model.blank_invalid_non_setup_fields! }.not_to change(model, :needstype)
+      end
+    end
+
+    context "when a setup field is invalid for a sales log" do
+      subject(:model) { build(:sales_log, companybuy: 404) }
+
+      it "does not blank it" do
+        model.valid?
+        expect { model.blank_invalid_non_setup_fields! }.not_to change(model, :companybuy)
+      end
+    end
+
+    context "when a non setup field is invalid for a lettings log" do
+      subject(:model) { build(:lettings_log, :completed, offered: 234) }
+
+      it "blanks it" do
+        model.valid?
+        model.blank_invalid_non_setup_fields!
+        expect(model.offered).to be_nil
+      end
+    end
+
+    context "when a non setup field is invalid for a sales log" do
+      subject(:model) { build(:sales_log, :completed, age1: 10) }
+
+      it "blanks it" do
+        model.valid?
+        model.blank_invalid_non_setup_fields!
+        expect(model.age1).to be_nil
+      end
+    end
+
+    context "when prevloc is invalid for a lettings log" do
+      subject(:model) { build(:lettings_log, :completed, previous_la_known: 1, prevloc: nil) }
+
+      it "blanks previous_la_known" do
+        model.valid?
+        model.blank_invalid_non_setup_fields!
+        expect(model.previous_la_known).to be_nil
+      end
+    end
+  end
 end