Handle NaN funding fees

closes #9831

freqtrade/exchange/exchange.py

@@ -8,7 +8,7 @@ import logging
 import signal
 from copy import deepcopy
 from datetime import datetime, timedelta, timezone
-from math import floor
+from math import floor, isnan
 from threading import Lock
 from typing import Any, Coroutine, Dict, List, Literal, Optional, Tuple, Union
 
@@ -2916,7 +2916,8 @@ class Exchange:
         if not df.empty:
             df1 = df[(df['date'] >= open_date) & (df['date'] <= close_date)]
             fees = sum(df1['open_fund'] * df1['open_mark'] * amount)
-
+        if isnan(fees):
+            fees = 0.0
         # Negate fees for longs as funding_fees expects it this way based on live endpoints.
         return fees if is_short else -fees
 

tests/exchange/test_exchange.py

@@ -7,6 +7,7 @@ from unittest.mock import MagicMock, Mock, PropertyMock, patch
 
 import ccxt
 import pytest
+from numpy import NaN
 from pandas import DataFrame
 
 from freqtrade.enums import CandleType, MarginMode, RunMode, TradingMode
@@ -4203,6 +4204,7 @@ def test_get_max_leverage_from_margin(default_conf, mocker, pair, nominal_value,
         (10, 0.0001, 2.0, 1.0, 0.002, 0.002),
         (10, 0.0002, 2.0, 0.01, 0.004, 0.00004),
         (10, 0.0002, 2.5, None, 0.005, None),
+        (10, 0.0002, NaN, None, 0.0, None),
     ])
 def test_calculate_funding_fees(
     default_conf,