From 3c964a7d51837b40ce0c1112c79f6aeea066f65b Mon Sep 17 00:00:00 2001
From: Frederik Jaeckel <frederik.jaeckel@m-ds.de>
Date: Wed, 28 Jun 2023 13:41:10 +0200
Subject: [PATCH] fix: exception if no bookings in cashbook used for evaluation

---
 line.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/line.py b/line.py
index d4e4ab4..ca853a5 100644
--- a/line.py
+++ b/line.py
@@ -154,6 +154,8 @@ class EvaluationLine(ModelSQL, ModelView):
         Currency = Pool().get('currency.currency')
 
         exp = Decimal(Decimal(1) / 10 ** self.currency_digits)
+        if amount is None:
+            return Decimal('0.0')
         return Currency.compute(
                 from_currency,
                 amount,