diff --git a/import2ledger/importers/nbpy2017.py b/import2ledger/importers/nbpy2017.py
index 31927c2c28f89784d8585b0424569f916179dda8..0e5f89cd2e8df5f4398be026e7847989566fdb19 100644
--- a/import2ledger/importers/nbpy2017.py
+++ b/import2ledger/importers/nbpy2017.py
@@ -82,14 +82,17 @@ class Invoice2017:
         self.shirts_sold = decimal.Decimal(0)
         self.shirt_rate = self.STANDARD_SHIRT_RATE
         for description, qty, unit_price, total in rows_text:
+            if qty is None:
+                continue
+            total = strparse.currency_decimal(total)
+            self.amount += total
             if description.startswith('Ticket - '):
-                self.tickets_sold += 1
+                if total > 0:
+                    self.tickets_sold += 1
             elif description.startswith('T-Shirt - '):
                 self.shirts_sold += 1
             elif description.startswith('Early Bird ('):
                 self.ticket_rate = self.DISCOUNT_TICKET_RATE
-            if qty:
-                self.amount += strparse.currency_decimal(total)
 
     def _read_invoice_activity(self, table, first_row_text, rows_text):
         self.actions = [{