fix: check if key present in settings before updating (#2306)

lnbits/core/services.py

@@ -709,7 +709,10 @@ async def check_webpush_settings():
 
 def update_cached_settings(sets_dict: dict):
     for key, value in sets_dict.items():
-        if key not in readonly_variables:
+        if key in readonly_variables:
+            continue
+        if key not in settings.dict().keys():
+            continue
         try:
             setattr(settings, key, value)
         except Exception: