diff -r 65d02e2fa425 trytond/trytond/modules/analytic_invoice/invoice.py
--- a/trytond/trytond/modules/analytic_invoice/invoice.py	Mon May 06 15:00:15 2019 +0200
+++ b/trytond/trytond/modules/analytic_invoice/invoice.py	Tue Nov 12 23:33:28 2019 +0100
@@ -54,6 +54,8 @@
             for line in lines:
                 analytic_lines = []
                 for entry in self.analytic_accounts:
+                    if not entry.account:
+                        continue
                     analytic_lines.extend(
                         entry.get_analytic_lines(line, date))
                 line.analytic_lines = analytic_lines