Address ZeroDivisionExceptiond

closes #4764 closes #4617

freqtrade/persistence/models.py

@@ -547,6 +547,8 @@ class LocalTrade():
             rate=(rate or self.close_rate),
             fee=(fee or self.fee_close)
         )
+        if self.open_trade_value == 0.0:
+            return 0.0
         profit_ratio = (close_trade_value / self.open_trade_value) - 1
         return float(f"{profit_ratio:.8f}")
 

tests/test_persistence.py

@@ -388,6 +388,9 @@ def test_calc_profit_ratio(limit_buy_order, limit_sell_order, fee):
     # Test with a custom fee rate on the close trade
     assert trade.calc_profit_ratio(fee=0.003) == 0.06147824
 
+    trade.open_trade_value = 0.0
+    assert trade.calc_profit_ratio(fee=0.003) == 0.0
+
 
 @pytest.mark.usefixtures("init_persistence")
 def test_clean_dry_run_db(default_conf, fee):