From d7ad61557b4c62f39c26c6e32704c5647b0b691d Mon Sep 17 00:00:00 2001
From: Timotheus Pokorra <timotheus.pokorra@solidcharity.com>
Date: Sun, 29 May 2022 20:37:09 +0200
Subject: [PATCH] avoid startRate of 0 division error

---
 apps/monitor/calc.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/apps/monitor/calc.py b/apps/monitor/calc.py
index fb2e6dc..db1fa66 100644
--- a/apps/monitor/calc.py
+++ b/apps/monitor/calc.py
@@ -49,11 +49,14 @@ class Calc:
                   ORDER BY rate ASC LIMIT 1"""
         cursor.execute(sql, [Crypto, Fiat, startDate, endDate])
         minRate = cursor.fetchone()
+        diffPercentage = -1
+        if startRate[1] > 0:
+            diffPercentage = (Decimal(endRate[1])-Decimal(startRate[1]))/Decimal(startRate[1])*100
         return {"startdate": startRate[0], "startvalue": startRate[1],
                 "curdate": endRate[0], "curvalue": endRate[1],
                 "mindate": minRate[0], "minvalue": minRate[1],
                 "maxdate": maxRate[0], "maxvalue": maxRate[1],
-                "diffPercentage": (Decimal(endRate[1])-Decimal(startRate[1]))/Decimal(startRate[1])*100}
+                "diffPercentage": diffPercentage}
     return None