diff --git a/freqtrade/data/btanalysis.py b/freqtrade/data/btanalysis.py
index 513fba9e7..2b51f5371 100644
--- a/freqtrade/data/btanalysis.py
+++ b/freqtrade/data/btanalysis.py
@@ -347,7 +347,7 @@ def create_cum_profit(df: pd.DataFrame, trades: pd.DataFrame, col_name: str,
     # Resample to timeframe to make sure trades match candles
     _trades_sum = trades.resample(f'{timeframe_minutes}min', on='close_date'
                                   )[['profit_percent']].sum()
-    df.loc[:, col_name] = _trades_sum.cumsum()
+    df.loc[:, col_name] = _trades_sum['profit_percent'].cumsum()
     # Set first value to 0
     df.loc[df.iloc[0].name, col_name] = 0
     # FFill to get continuous
diff --git a/tests/rpc/test_rpc_apiserver.py b/tests/rpc/test_rpc_apiserver.py
index e7eee6f05..5e608fb25 100644
--- a/tests/rpc/test_rpc_apiserver.py
+++ b/tests/rpc/test_rpc_apiserver.py
@@ -929,7 +929,7 @@ def test_api_pair_candles(botclient, ohlcv_history):
              ['2017-11-26 08:55:00', 8.88e-05, 8.942e-05, 8.88e-05,
                  8.893e-05, 0.05874751, 8.886500000000001e-05, 1, 0, 1511686500000, 8.88e-05, None],
              ['2017-11-26 09:00:00', 8.891e-05, 8.893e-05, 8.875e-05, 8.877e-05,
-                 0.7039405, 8.885000000000002e-05, 0, 0, 1511686800000, None, None]
+                 0.7039405, 8.885e-05, 0, 0, 1511686800000, None, None]
 
              ])