diff --git a/app.py b/app.py
index d076f88..7d6925b 100644
--- a/app.py
+++ b/app.py
@@ -40,10 +40,10 @@ with open(config_file, encoding="utf-8") as f:
 IOBROKER_HOST = config["IOBROKER_HOST"]
 IOBROKER_PORT = config["IOBROKER_PORT"]
 IOBROKER_DP = config["IOBROKER_DP"]
-INFLUX_URL = config["INFLUX_URL"]
-INFLUX_ORG = config["INFLUX_ORG"]
-INFLUX_BUCKET = config["INFLUX_BUCKET"]
-INFLUX_TOKEN = config["INFLUX_TOKEN"]
+INFLUX_URL = config.get("INFLUX_URL")
+INFLUX_ORG = config.get("INFLUX_ORG")
+INFLUX_BUCKET = config.get("INFLUX_BUCKET")
+INFLUX_TOKEN = config.get("INFLUX_TOKEN")
 BALANCE_YELLOW_DAY = int(
     config["BALANCE_YELLOW_DAY"]
 )
@@ -185,7 +185,13 @@ def get_balance_color(balance):
 
 
 def get_balance_history(days=30):
-
+    if not all([
+        INFLUX_URL,
+        INFLUX_ORG,
+        INFLUX_BUCKET,
+        INFLUX_TOKEN
+    ]):
+        return []
     client = InfluxDBClient(
         url=INFLUX_URL,
         token=INFLUX_TOKEN,