Fix 0 Division error on exchanges without average

closes #6461

freqtrade/persistence/models.py

@@ -195,6 +195,7 @@ class Order(_DECL_BASE):
         return {
             'amount': self.amount,
             'average': round(self.average, 8) if self.average else 0,
+            'safe_price': self.safe_price,
             'cost': self.cost if self.cost else 0,
             'filled': self.filled,
             'ft_order_side': self.ft_order_side,

freqtrade/rpc/telegram.py

@@ -370,15 +370,18 @@ class Telegram(RPCHandler):
         else:
             return "\N{CROSS MARK}"
 
-    def _prepare_entry_details(self, filled_orders, base_currency, is_open):
+    def _prepare_entry_details(self, filled_orders: List, base_currency: str, is_open: bool):
         """
         Prepare details of trade with entry adjustment enabled
         """
-        lines = []
+        lines: List[str] = []
+        if len(filled_orders) > 0:
+            first_avg = filled_orders[0]["safe_price"]
+
         for x, order in enumerate(filled_orders):
             cur_entry_datetime = arrow.get(order["order_filled_date"])
             cur_entry_amount = order["amount"]
-            cur_entry_average = order["average"]
+            cur_entry_average = order["safe_price"]
             lines.append("  ")
             if x == 0:
                 lines.append("*Entry #{}:*".format(x+1))
@@ -389,12 +392,14 @@ class Telegram(RPCHandler):
                 sumA = 0
                 sumB = 0
                 for y in range(x):
-                    sumA += (filled_orders[y]["amount"] * filled_orders[y]["average"])
+                    sumA += (filled_orders[y]["amount"] * filled_orders[y]["safe_price"])
                     sumB += filled_orders[y]["amount"]
-                prev_avg_price = sumA/sumB
-                price_to_1st_entry = ((cur_entry_average - filled_orders[0]["average"])
-                                      / filled_orders[0]["average"])
-                minus_on_entry = (cur_entry_average - prev_avg_price)/prev_avg_price
+                prev_avg_price = sumA / sumB
+                price_to_1st_entry = ((cur_entry_average - first_avg) / first_avg)
+                minus_on_entry = 0
+                if prev_avg_price:
+                    minus_on_entry = (cur_entry_average - prev_avg_price) / prev_avg_price
+
                 dur_entry = cur_entry_datetime - arrow.get(filled_orders[x-1]["order_filled_date"])
                 days = dur_entry.days
                 hours, remainder = divmod(dur_entry.seconds, 3600)

tests/rpc/test_rpc.py

@@ -110,7 +110,7 @@ def test_rpc_trade_status(default_conf, ticker, fee, mocker) -> None:
         'open_order': None,
         'exchange': 'binance',
         'filled_entry_orders': [{
-            'amount': 91.07468123, 'average': 1.098e-05,
+            'amount': 91.07468123, 'average': 1.098e-05, 'safe_price': 1.098e-05,
             'cost': 0.0009999999999054, 'filled': 91.07468123, 'ft_order_side': 'buy',
             'order_date': ANY, 'order_timestamp': ANY, 'order_filled_date': ANY,
             'order_filled_timestamp': ANY, 'order_type': 'limit', 'price': 1.098e-05,
@@ -185,7 +185,7 @@ def test_rpc_trade_status(default_conf, ticker, fee, mocker) -> None:
         'open_order': None,
         'exchange': 'binance',
         'filled_entry_orders': [{
-            'amount': 91.07468123, 'average': 1.098e-05,
+            'amount': 91.07468123, 'average': 1.098e-05, 'safe_price': 1.098e-05,
             'cost': 0.0009999999999054, 'filled': 91.07468123, 'ft_order_side': 'buy',
             'order_date': ANY, 'order_timestamp': ANY, 'order_filled_date': ANY,
             'order_filled_timestamp': ANY, 'order_type': 'limit', 'price': 1.098e-05,

tests/rpc/test_rpc_telegram.py

@@ -236,6 +236,8 @@ def test_telegram_status_multi_entry(default_conf, update, mocker, fee) -> None:
     create_mock_trades(fee)
     trades = Trade.get_open_trades()
     trade = trades[0]
+    # Average may be empty on some exchanges
+    trade.orders[0].average = 0
     trade.orders.append(Order(
         order_id='5412vbb',
         ft_order_side='buy',
@@ -246,7 +248,7 @@ def test_telegram_status_multi_entry(default_conf, update, mocker, fee) -> None:
         order_type="market",
         side="buy",
         price=trade.open_rate * 0.95,
-        average=trade.open_rate * 0.95,
+        average=0,
         filled=trade.amount,
         remaining=0,
         cost=trade.amount,