diff --git a/wowlet_backend/tasks/historical_prices.py b/wowlet_backend/tasks/historical_prices.py
index 1ed0e44..89d11df 100644
--- a/wowlet_backend/tasks/historical_prices.py
+++ b/wowlet_backend/tasks/historical_prices.py
@@ -9,6 +9,7 @@ from typing import List, Union
 from datetime import datetime
 
 import aiofiles
+from quart import current_app as app
 
 import settings
 from wowlet_backend.utils import httpget
@@ -93,6 +94,15 @@ class HistoricalPriceTask(WowletTask):
         data filtered by the parameters."""
         from wowlet_backend.factory import cache
 
+        # redis keys are always strings, convert input parameters
+        year = str(year)
+        if isinstance(month, int):
+            month = str(month)
+
+        if not year.isnumeric() or (month and not month.isnumeric()):
+            app.logger.error(f"get() called with year: {year}, month {month}, not a number")
+            return
+
         blob = await cache.get("historical_fiat")
         blob = json.loads(blob)
         if year not in blob:
@@ -102,13 +112,13 @@ class HistoricalPriceTask(WowletTask):
         if not month:
             for _m, days in blob[year].items():
                 for day, price in days.items():
-                    rtn[datetime(year, _m, day).strftime('%Y%m%d')] = price
+                    rtn[datetime(int(year), int(_m), int(day)).strftime('%Y%m%d')] = price
             return rtn
 
         if month not in blob[year]:
             return
 
         for day, price in blob[year][month].items():
-            rtn[datetime(year, month, day).strftime('%Y%m%d')] = price
+            rtn[datetime(int(year), int(month), int(day)).strftime('%Y%m%d')] = price
 
         return rtn
diff --git a/wowlet_backend/tasks/yellow.py b/wowlet_backend/tasks/yellow.py
index 7b47852..6fc13c2 100644
--- a/wowlet_backend/tasks/yellow.py
+++ b/wowlet_backend/tasks/yellow.py
@@ -2,6 +2,7 @@
 # Copyright (c) 2022, The Monero Project.
 # Copyright (c) 2022, dsc@xmr.pm
 
+from typing import List
 from dateutil.parser import parse
 
 import settings
@@ -21,7 +22,7 @@ class YellWowTask(WowletTask):
 
         self._http_endpoint = "https://yellow.wownero.com/api/user/"
 
-    async def task(self) -> list[dict]:
+    async def task(self) -> List[dict]:
         blob = await httpget(self._http_endpoint)
         if not isinstance(blob, list) or not blob:
             raise Exception(f"Invalid JSON response for {self._http_endpoint}")