diff --git a/app.py b/app.py
index 279f5fc..23ec526 100644
--- a/app.py
+++ b/app.py
@@ -29,7 +29,8 @@ def get(self) -> list[dict]:
         data: list[dict] = []
         if HAS_UWSGI:
             data = uwsgi.cache_get("received_mail", "light_mail")
-            data = json.loads(data)
+            if data is not None:
+                data = json.loads(data)
         return data
 
     def set(self, data) -> None: