diff --git a/lightrag/kg/mongo_impl.py b/lightrag/kg/mongo_impl.py
index abd9a7c4..92c45638 100644
--- a/lightrag/kg/mongo_impl.py
+++ b/lightrag/kg/mongo_impl.py
@@ -89,7 +89,7 @@ class MongoKVStorage(BaseKVStorage):
             global_config=global_config,
             embedding_func=embedding_func,
         )
-        self.__post_init__()
+        # __post_init__() is automatically called by dataclass
 
     def __post_init__(self):
         # Check for MONGODB_WORKSPACE environment variable first (higher priority)
@@ -317,7 +317,7 @@ class MongoDocStatusStorage(DocStatusStorage):
             global_config=global_config,
             embedding_func=embedding_func,
         )
-        self.__post_init__()
+        # __post_init__() is automatically called by dataclass
 
     def __post_init__(self):
         # Check for MONGODB_WORKSPACE environment variable first (higher priority)
@@ -2052,9 +2052,12 @@ class MongoVectorDBStorage(BaseVectorStorage):
             embedding_func=embedding_func,
             meta_fields=meta_fields or set(),
         )
-        self.__post_init__()
+        # __post_init__() is automatically called by dataclass
 
     def __post_init__(self):
+        # Call parent class __post_init__ to validate embedding_func
+        super().__post_init__()
+
         # Check for MONGODB_WORKSPACE environment variable first (higher priority)
         # This allows administrators to force a specific workspace for all MongoDB storage instances
         mongodb_workspace = os.environ.get("MONGODB_WORKSPACE")
diff --git a/lightrag/kg/qdrant_impl.py b/lightrag/kg/qdrant_impl.py
index f32a9243..277c5dbb 100644
--- a/lightrag/kg/qdrant_impl.py
+++ b/lightrag/kg/qdrant_impl.py
@@ -121,7 +121,7 @@ class QdrantVectorDBStorage(BaseVectorStorage):
             embedding_func=embedding_func,
             meta_fields=meta_fields or set(),
         )
-        self.__post_init__()
+        # __post_init__() is automatically called by dataclass
 
     @staticmethod
     def setup_collection(
@@ -410,6 +410,9 @@ class QdrantVectorDBStorage(BaseVectorStorage):
             )
 
     def __post_init__(self):
+        # Call parent class __post_init__ to validate embedding_func
+        super().__post_init__()
+
         # Check for QDRANT_WORKSPACE environment variable first (higher priority)
         # This allows administrators to force a specific workspace for all Qdrant storage instances
         qdrant_workspace = os.environ.get("QDRANT_WORKSPACE")