diff --git a/calculator/main.py b/calculator/main.py
index 840bd2f..4423cd9 100644
--- a/calculator/main.py
+++ b/calculator/main.py
@@ -2,10 +2,10 @@ import datetime
 import calendar
 from typing import List
 
-from fastapi import FastAPI
+from fastapi import FastAPI, HTTPException
 from fastapi.responses import RedirectResponse
 
-from calculator.miner import get_energy_prices, get_eur_czk_ratio
+from calculator.miner import PriceNotFound, get_energy_prices, get_eur_czk_ratio
 from calculator.schema import CheapestHours, DayPrice, Price
 
 from .consts import VAT
@@ -92,7 +92,10 @@ def read_item(
     spot_hours = {}
     spot_hours_for_sell = {}
     spot_hours_total = {}
-    spot_data = get_energy_prices(date, no_cache=no_cache)
+    try:
+        spot_data = get_energy_prices(date, no_cache=no_cache)
+    except PriceNotFound:
+        raise HTTPException(status_code=404, detail="prices not found")
     for key, value in spot_data.items():
         kwh_fees = kwh_fees_low if int(key) in low_tariff_hours_parsed else kwh_fees_high
 
diff --git a/calculator/miner.py b/calculator/miner.py
index b94dec6..b3bd988 100644
--- a/calculator/miner.py
+++ b/calculator/miner.py
@@ -8,6 +8,7 @@ import requests
 
 
 class PriceException(Exception): pass
+class PriceNotFound(Exception): pass
 
 
 url_energy = "https://www.ote-cr.cz/cs/kratkodobe-trhy/elektrina/denni-trh/@@chart-data?report_date={}"
@@ -33,8 +34,11 @@ def get_energy_prices(d: datetime.date=datetime.date.today(), no_cache:bool=Fals
     if not hours or no_cache:
         r = requests.get(url_energy.format(date_str))
 
-        for raw in r.json()["data"]["dataLine"][1]["point"]:
-            hours[str(int(raw["x"])-1)] = raw["y"]
+        try:
+            for raw in r.json()["data"]["dataLine"][1]["point"]:
+                hours[str(int(raw["x"])-1)] = raw["y"]
+        except IndexError:
+            raise PriceNotFound()
         
         with open(cache_file, "w") as f:
             f.write(json.dumps(hours))