diff --git a/CHANGELOG.md b/CHANGELOG.md
index 270c9dfcd..d8b59f0d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 # Changelog Fab-manager
 
+- Fix a bug: unable to build accounting lines if no invoices
 - Fix a security issue: updated json5 to 1.0.2 to fix [CVE-2022-46175](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-46175)
 
 ## v5.6.0 2023 January 5
diff --git a/lib/tasks/fablab/setup.rake b/lib/tasks/fablab/setup.rake
index 360f9f76d..e9c613bfc 100644
--- a/lib/tasks/fablab/setup.rake
+++ b/lib/tasks/fablab/setup.rake
@@ -12,9 +12,7 @@ namespace :fablab do
 
     desc 'add missing VAT rate to history'
     task :add_vat_rate, %i[rate date] => :environment do |_task, args|
-      unless args.rate && args.date
-        raise 'Missing argument. Usage exemple: rails fablab:setup:add_vat_rate[20,2014-01-01]. Use 0 to disable'
-      end
+      raise 'Missing argument. Usage exemple: rails fablab:setup:add_vat_rate[20,2014-01-01]. Use 0 to disable' unless args.rate && args.date
 
       if args.rate == '0'
         setting = Setting.find_by(name: 'invoice_VAT-active')
@@ -129,7 +127,7 @@ namespace :fablab do
 
     desc 'generate acconting lines'
     task build_accounting_lines: :environment do
-      start_date = Invoice.order(created_at: :asc).first&.created_at
+      start_date = Invoice.order(created_at: :asc).first&.created_at || DateTime.current
       end_date = DateTime.current
       AccountingLine.where(date: start_date..end_date).destroy_all
       Accounting::AccountingService.new.build(start_date&.beginning_of_day, end_date.end_of_day)