diff --git a/app/core/models/node_storage.py b/app/core/models/node_storage.py
index ca968ec..b70a2f5 100644
--- a/app/core/models/node_storage.py
+++ b/app/core/models/node_storage.py
@@ -1,7 +1,9 @@
 from base58 import b58decode
 from sqlalchemy import Column, BigInteger, Integer, String, ForeignKey, DateTime, JSON, Boolean
 from sqlalchemy.orm import relationship
+from datetime import datetime
 
+from app.core.logger import make_log
 from app.core.content.content_id import ContentId
 from .base import AlchemyBase
 
@@ -70,6 +72,6 @@ class StoredContent(AlchemyBase):
             "hash": self.hash,
             "cid": self.cid.serialize_v1(),
             "status": self.status,
-            "updated": self.updated.isoformat() if self.updated else None,
-            "created": self.created.isoformat() if self.created else None,
+            "updated": self.updated.isoformat() if isinstance(self.updated, datetime) else (make_log("Content.json_format", f"Invalid Content.updated: {self.updated} ({type(self.updated)})", level="error") or None),
+            "created": self.created.isoformat() if isinstance(self.created, datetime) else (make_log("Content.json_format", f"Invalid Content.created: {self.created} ({type(self.created)})", level="error") or None),
         }