diff --git a/src/backend/langflow/api/v1/endpoints.py b/src/backend/langflow/api/v1/endpoints.py
index 51a397e1c..a6b85dde2 100644
--- a/src/backend/langflow/api/v1/endpoints.py
+++ b/src/backend/langflow/api/v1/endpoints.py
@@ -1,5 +1,5 @@
 from http import HTTPStatus
-from typing import Annotated, Optional
+from typing import Annotated, Optional, Union
 
 from langflow.services.cache.utils import save_uploaded_file
 from langflow.services.database.models.flow import Flow
@@ -75,7 +75,7 @@ async def process_flow(
     inputs: Optional[dict] = None,
     tweaks: Optional[dict] = None,
     clear_cache: Annotated[bool, Body(embed=True)] = False,  # noqa: F821
-    session_id: Annotated[str, Body(embed=True)] = None,  # noqa: F821
+    session_id: Annotated[Union[None, str], Body(embed=True)] = None,  # noqa: F821
     session: Session = Depends(get_session),
 ):
     """
diff --git a/src/backend/langflow/api/v1/schemas.py b/src/backend/langflow/api/v1/schemas.py
index 1b1d763f3..65bf64dca 100644
--- a/src/backend/langflow/api/v1/schemas.py
+++ b/src/backend/langflow/api/v1/schemas.py
@@ -47,7 +47,7 @@ class ProcessResponse(BaseModel):
     """Process response schema."""
 
     result: dict
-    session_id: str = None
+    session_id: Optional[str] = None
 
 
 class ChatMessage(BaseModel):
diff --git a/src/backend/langflow/interface/run.py b/src/backend/langflow/interface/run.py
index cb0573bf7..42cea0e98 100644
--- a/src/backend/langflow/interface/run.py
+++ b/src/backend/langflow/interface/run.py
@@ -1,3 +1,4 @@
+from typing import Any, Dict, Tuple
 from langflow.services.cache.utils import memoize_dict
 from langflow.graph import Graph
 from langflow.utils.logger import logger
@@ -15,7 +16,7 @@ def build_langchain_object_with_caching(data_graph):
 
 
 @memoize_dict(maxsize=10)
-def build_sorted_vertices_with_caching(data_graph):
+def build_sorted_vertices_with_caching(data_graph) -> Tuple[Any, Dict]:
     """
     Build langchain object from data_graph.
     """
diff --git a/src/backend/langflow/processing/process.py b/src/backend/langflow/processing/process.py
index dc632e76b..396135e16 100644
--- a/src/backend/langflow/processing/process.py
+++ b/src/backend/langflow/processing/process.py
@@ -109,7 +109,7 @@ def clear_caches_if_needed(clear_cache: bool):
 
 def load_langchain_object(
     data_graph: Dict[str, Any], session_id: str
-) -> Tuple[Union[Chain, VectorStore], Dict[str, Any]]:
+) -> Tuple[Union[Chain, VectorStore], Dict[str, Any], str]:
     langchain_object, artifacts = get_build_result(data_graph, session_id)
     session_id = build_sorted_vertices_with_caching.hash
     logger.debug("Loaded LangChain object")