diff --git a/src/app/app.py b/src/app/app.py
index c8cdee4..9dcecab 100644
--- a/src/app/app.py
+++ b/src/app/app.py
@@ -177,7 +177,8 @@ class WebDbApplication(BaseApplication):
     async def get(self, key, default=None):
         record = self.db["kv"].find_one(key=key)
         if record:
-            return json.loads(record.get("value", "null"))
+            result = record.get("value","null")
+            return result == "null" and default or json.loads(result)
         return default
 
     async def insert(self, table_name, data):
@@ -189,12 +190,12 @@ class WebDbApplication(BaseApplication):
     async def upsert(self, table_name, data, keys):
         return self.db[table_name].upsert(data, keys or [])
 
-    async def find(self, table_name, filters):
+    async def find(self, table_name, filters=None):
         if not filters:
             filters = {}
         return [dict(record) for record in self.db[table_name].find(**filters)]
 
-    async def find_one(self, table_name, filters):
+    async def find_one(self, table_name, filters=None):
         if not filters:
             filters = {}
         try: