diff --git a/app/services/bulk_upload/lettings/log_creator.rb b/app/services/bulk_upload/lettings/log_creator.rb
index e6ef290b1..e913bf04a 100644
--- a/app/services/bulk_upload/lettings/log_creator.rb
+++ b/app/services/bulk_upload/lettings/log_creator.rb
@@ -8,6 +8,9 @@ class BulkUpload::Lettings::LogCreator
 
   def call
     row_parsers.each do |row_parser|
+      row_parser.valid?
+
+      row_parser.log.blank_invalid_non_setup_fields!
       row_parser.log.bulk_upload = bulk_upload
       row_parser.log.save
     end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index e25631df7..d1781b513 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -32,8 +32,8 @@ Capybara.javascript_driver = :headless
 # of increasing the boot-up time by auto-requiring all files in the support
 # directory. Alternatively, in the individual `*_spec.rb` files, manually
 # require only the support files necessary.
-#
-# Dir[Rails.root.join('spec', 'support', '**', '*.rb')].sort.each { |f| require f }
+
+Dir[Rails.root.join("spec", "support", "**", "*.rb")].sort.each { |f| require f }
 
 # Checks for pending migrations and applies them before tests are run.
 # If you are not using ActiveRecord, you can remove these lines.
diff --git a/spec/services/bulk_upload/lettings/log_creator_spec.rb b/spec/services/bulk_upload/lettings/log_creator_spec.rb
index 734907898..acf297dcf 100644
--- a/spec/services/bulk_upload/lettings/log_creator_spec.rb
+++ b/spec/services/bulk_upload/lettings/log_creator_spec.rb
@@ -24,6 +24,43 @@ RSpec.describe BulkUpload::Lettings::LogCreator do
       end
     end
 
+    context "when a valid csv with row with one invalid non setup field" do
+      let(:file) { Tempfile.new }
+      let(:path) { file.path }
+      let(:log) do
+        build(
+          :lettings_log,
+          :completed,
+          renttype: 3,
+          age1: 5,
+          owning_organisation: owning_org,
+          managing_organisation: owning_org,
+          national: 18,
+          waityear: 9,
+          joint: 2,
+          tenancy: 9,
+          ppcodenk: 0,
+        )
+      end
+
+      before do
+        5.times { file.write "\n" }
+        file.write(BulkUpload::LogToCsv.new(log:).to_csv_row)
+        file.rewind
+      end
+
+      it "creates the log" do
+        expect { service.call }.to change(LettingsLog, :count).by(1)
+      end
+
+      it "blanks invalid field" do
+        service.call
+
+        record = LettingsLog.last
+        expect(record.age1).to be_blank
+      end
+    end
+
     context "when valid csv with existing log" do
       xit "what should happen?"
     end
diff --git a/spec/support/bulk_upload/log_to_csv.rb b/spec/support/bulk_upload/log_to_csv.rb
new file mode 100644
index 000000000..4bca53358
--- /dev/null
+++ b/spec/support/bulk_upload/log_to_csv.rb
@@ -0,0 +1,254 @@
+class BulkUpload::LogToCsv
+  attr_reader :log
+
+  def initialize(log:)
+    @log = log
+  end
+
+  def to_csv_row
+    [
+      nil, # 0
+      log.renttype, # 1
+      nil,
+      nil,
+      log.scheme&.old_visible_id,
+      log.location&.old_visible_id,
+      nil,
+      log.tenancycode,
+      log.startertenancy,
+      log.tenancy,
+      log.tenancyother, # 10
+      log.tenancylength,
+      log.age1,
+      log.age2,
+      log.age3,
+      log.age4,
+      log.age5,
+      log.age6,
+      log.age7,
+      log.age8,
+
+      log.sex1, # 20
+      log.sex2,
+      log.sex3,
+      log.sex4,
+      log.sex5,
+      log.sex6,
+      log.sex7,
+      log.sex8,
+
+      log.relat2,
+      log.relat3,
+      log.relat4, # 30
+      log.relat5,
+      log.relat6,
+      log.relat7,
+      log.relat8,
+
+      log.ecstat1,
+      log.ecstat2,
+      log.ecstat3,
+      log.ecstat4,
+      log.ecstat5,
+      log.ecstat6, # 40
+      log.ecstat7,
+      log.ecstat8,
+
+      log.ethnic,
+      log.national,
+      log.armedforces,
+      log.reservist,
+      log.preg_occ,
+      log.hb,
+      log.benefits,
+      log.earnings, # 50
+      net_income_known,
+      nil,
+      log.reasonother,
+      nil,
+      nil,
+      nil,
+      nil,
+      nil,
+      nil,
+      nil, # 60
+      log.prevten,
+      log.prevloc,
+      ((log.ppostcode_full || "").split(" ") || [""]).first,
+      ((log.ppostcode_full || "").split(" ") || [""]).last,
+      previous_postcode_known,
+      log.layear,
+      log.waityear,
+      homeless,
+      log.reasonpref,
+      log.rp_homeless, # 70
+      log.rp_insan_unsat,
+      log.rp_medwel,
+      log.rp_hardship,
+      log.rp_dontknow,
+      cbl,
+      chr,
+      cap,
+      log.referral,
+      log.period,
+
+      log.brent, # 80
+      log.scharge,
+      log.pscharge,
+      log.supcharg,
+      log.tcharge,
+      log.chcharge,
+      log.household_charge,
+      log.hbrentshortfall,
+      log.tshortfall,
+      log.voiddate&.day,
+
+      log.voiddate&.month, # 90
+      log.voiddate&.strftime("%y"),
+      log.mrcdate&.day,
+      log.mrcdate&.month,
+      log.mrcdate&.strftime("%y"),
+      nil,
+      log.startdate&.day,
+      log.startdate&.month,
+      log.startdate&.strftime("%y"),
+      log.offered,
+
+      log.propcode, # 100
+      log.beds,
+      log.unittype_gn,
+      log.builtype,
+      log.wchair,
+      log.unitletas,
+      log.rsnvac,
+      log.la,
+      ((log.postcode_full || "").split(" ") || [""]).first,
+      ((log.postcode_full || "").split(" ") || [""]).last,
+
+      nil, # 110
+      log.owning_organisation&.old_visible_id,
+      nil,
+      log.managing_organisation&.old_visible_id,
+      leftreg,
+      nil,
+      log.incfreq,
+      log.sheltered,
+      log.illness,
+      log.illness_type_1,
+
+      log.illness_type_2, # 120
+      log.illness_type_3,
+      log.illness_type_4,
+      log.illness_type_5,
+      log.illness_type_6,
+      log.illness_type_7,
+      log.illness_type_8,
+      log.illness_type_9,
+      log.illness_type_10,
+      london_affordable_rent,
+
+      intermediate_rent_type, # 130
+      log.irproduct_other,
+      log.declaration,
+      log.joint,
+      renewal,
+      "\n",
+    ].join(",")
+  end
+
+  def renewal
+    case log.renewal
+    when 1
+      1
+    when 0
+      2
+    end
+  end
+
+  def london_affordable_rent
+    case log.renttype
+    when Imports::LettingsLogsImportService::RENT_TYPE[:london_affordable_rent]
+      1
+    end
+  end
+
+  def intermediate_rent_type
+    case log.renttype
+    when Imports::LettingsLogsImportService::RENT_TYPE[:rent_to_buy]
+      1
+    when Imports::LettingsLogsImportService::RENT_TYPE[:london_living_rent]
+      2
+    when Imports::LettingsLogsImportService::RENT_TYPE[:other_intermediate_rent_product]
+      3
+    end
+  end
+
+  def leftreg
+    case log.leftreg
+    when 3
+      3
+    when 1
+      4
+    when 2
+      5
+    when 0
+      6
+    end
+  end
+
+  def net_income_known
+    case log.net_income_known
+    when 0
+      1
+    when 1
+      2
+    when 2
+      4
+    end
+  end
+
+  def previous_postcode_known
+    case log.ppcodenk
+    when 1
+      1
+    when 0
+      2
+    end
+  end
+
+  def homeless
+    case log.homeless
+    when 1
+      1
+    when 11
+      12
+    end
+  end
+
+  def cbl
+    case log.cbl
+    when 0
+      2
+    when 1
+      1
+    end
+  end
+
+  def chr
+    case log.chr
+    when 0
+      2
+    when 1
+      1
+    end
+  end
+
+  def cap
+    case log.cap
+    when 0
+      2
+    when 1
+      1
+    end
+  end
+end