diff --git a/src/memos/graph_dbs/polardb.py b/src/memos/graph_dbs/polardb.py
index abfae7710..856f94f2a 100644
--- a/src/memos/graph_dbs/polardb.py
+++ b/src/memos/graph_dbs/polardb.py
@@ -899,13 +899,7 @@ def get_node(
                     logger.info(
                         f" polardb [get_node] get_node completed time in {elapsed_time:.2f}s"
                     )
-                    return self._parse_node(
-                        {
-                            "id": id,
-                            "memory": properties.get("memory", ""),
-                            **properties,
-                        }
-                    )
+                    return self._parse_node(properties)
                 return None
 
         except Exception as e:
@@ -976,15 +970,7 @@ def get_nodes(self, ids: list[str], user_name: str, **kwargs) -> list[dict[str,
                         properties["embedding"] = embedding
                     except (json.JSONDecodeError, TypeError):
                         logger.warning(f"Failed to parse embedding for node {node_id}")
-                nodes.append(
-                    self._parse_node(
-                        {
-                            "id": properties.get("id", node_id),
-                            "memory": properties.get("memory", ""),
-                            "metadata": properties,
-                        }
-                    )
-                )
+                nodes.append(self._parse_node(properties))
             return nodes
 
     @timed
@@ -1534,7 +1520,7 @@ def search_by_keywords_like(
         user_name_conditions = self._build_user_name_and_kb_ids_conditions_sql(
             user_name=user_name,
             knowledgebase_ids=knowledgebase_ids,
-            default_user_name=self.config.user_name,
+            default_user_name=self._get_config_value("user_name"),
         )
 
         # Add OR condition if we have any user_name conditions
@@ -1633,7 +1619,7 @@ def search_by_keywords_tfidf(
         user_name_conditions = self._build_user_name_and_kb_ids_conditions_sql(
             user_name=user_name,
             knowledgebase_ids=knowledgebase_ids,
-            default_user_name=self.config.user_name,
+            default_user_name=self._get_config_value("user_name"),
         )
 
         # Add OR condition if we have any user_name conditions
@@ -1751,7 +1737,7 @@ def search_by_fulltext(
         user_name_conditions = self._build_user_name_and_kb_ids_conditions_sql(
             user_name=user_name,
             knowledgebase_ids=knowledgebase_ids,
-            default_user_name=self.config.user_name,
+            default_user_name=self._get_config_value("user_name"),
         )
 
         if user_name_conditions:
@@ -1873,7 +1859,7 @@ def search_by_embedding(
         user_name_conditions = self._build_user_name_and_kb_ids_conditions_sql(
             user_name=user_name,
             knowledgebase_ids=knowledgebase_ids,
-            default_user_name=self.config.user_name,
+            default_user_name=self._get_config_value("user_name"),
         )
 
         if user_name_conditions:
diff --git a/src/memos/mem_reader/multi_modal_struct.py b/src/memos/mem_reader/multi_modal_struct.py
index 092f29ac6..2fd56d6b8 100644
--- a/src/memos/mem_reader/multi_modal_struct.py
+++ b/src/memos/mem_reader/multi_modal_struct.py
@@ -102,8 +102,9 @@ def _split_large_memory_item(
             split_items = []
 
             def _create_chunk_item(chunk):
-                # Chunk objects have a 'text' attribute
-                chunk_text = chunk.text
+                # Different chunkers are not fully consistent:
+                # some return Chunk-like objects with `.text`, while others return raw strings.
+                chunk_text = chunk.text if hasattr(chunk, "text") else chunk
                 if not chunk_text or not chunk_text.strip():
                     return None
                 # Create a new memory item for each chunk, preserving original metadata