diff --git a/agenda/fx.py b/agenda/fx.py
index 90cbc5f..efd4d7d 100644
--- a/agenda/fx.py
+++ b/agenda/fx.py
@@ -90,10 +90,14 @@ def get_rates(config: flask.config.Config) -> dict[str, Decimal]:
     except httpx.ConnectError:
         return read_cached_rates(full_path, currencies)
 
+    try:
+        data = json.loads(response.text, parse_float=Decimal)
+    except json.decoder.JSONDecodeError:
+        return read_cached_rates(full_path, currencies)
+
     with open(os.path.join(fx_dir, filename), "w") as file:
         file.write(response.text)
 
-    data = json.loads(response.text, parse_float=Decimal)
     return {
         cur: Decimal(data["quotes"][f"GBP{cur}"])
         for cur in currencies