diff --git a/freqtrade/plot/plotting.py b/freqtrade/plot/plotting.py
index e5173a29e..4d29337a7 100644
--- a/freqtrade/plot/plotting.py
+++ b/freqtrade/plot/plotting.py
@@ -440,8 +440,8 @@ def create_scatter(
 
 def generate_candlestick_graph(
         pair: str, data: pd.DataFrame, trades: Optional[pd.DataFrame] = None, *,
-        indicators1: List[str] = [], indicators2: List[str] = [],
-        plot_config: Dict[str, Dict] = {},
+        indicators1: Optional[List[str]] = None, indicators2: Optional[List[str]] = None,
+        plot_config: Optional[Dict[str, Dict]] = None,
         ) -> go.Figure:
     """
     Generate the graph from the data generated by Backtesting or from DB
@@ -454,7 +454,11 @@ def generate_candlestick_graph(
     :param plot_config: Dict of Dicts containing advanced plot configuration
     :return: Plotly figure
     """
-    plot_config = create_plotconfig(indicators1, indicators2, plot_config)
+    plot_config = create_plotconfig(
+        indicators1 or [],
+        indicators2 or [],
+        plot_config or {},
+    )
     rows = 2 + len(plot_config['subplots'])
     row_widths = [1 for _ in plot_config['subplots']]
     # Define the graph