diff --git a/app/core/models/node_storage.py b/app/core/models/node_storage.py
index 491de6d..9aac4ac 100644
--- a/app/core/models/node_storage.py
+++ b/app/core/models/node_storage.py
@@ -92,7 +92,7 @@ class StoredContent(AlchemyBase, AudioContentMixin):
                 'content_type': content_type or 'application/x-binary'
             }
         except BaseException as e:
-            make_log("NodeStorage.open_content", f"Can't open content: {self.id} {e}", level='error')
+            make_log("NodeStorage.open_content", f"Can't open content: {self.id} {e}", level='warning')
             raise e
 
     def json_format(self):
@@ -114,12 +114,21 @@ class StoredContent(AlchemyBase, AudioContentMixin):
             ]:
                 extra_fields[k] = self.meta.get(k, None)
 
-        spec_field_updated = self.updated.isoformat() if isinstance(self.updated, datetime) else (
-            datetime.fromisoformat(self.updated).isoformat() if isinstance(self.updated, str) else None
-        )
-        spec_field_created = self.created.isoformat() if isinstance(self.created, datetime) else (
-            datetime.fromisoformat(self.created).isoformat() if isinstance(self.created, str) else None
-        )
+        try:
+            spec_field_updated = self.updated.isoformat() if isinstance(self.updated, datetime) else (
+                datetime.fromisoformat(self.updated).isoformat() if isinstance(self.updated, str) else None
+            )
+        except BaseException as e:
+            make_log("StoredContent.json_format", f"[{self.id}] Can't convert updated field: {self.updated} {e}", level='debug')
+            spec_field_updated = datetime(1970, 1, 1).isoformat()
+
+        try:
+            spec_field_created = self.created.isoformat() if isinstance(self.created, datetime) else (
+                datetime.fromisoformat(self.created).isoformat() if isinstance(self.created, str) else None
+            )
+        except BaseException as e:
+            make_log("StoredContent.json_format", f"[{self.id}] Can't convert created field: {self.created} {e}", level='debug')
+            spec_field_created = datetime(1970, 1, 1).isoformat()
 
         return {
             **extra_fields,