diff --git a/libs/partners/upstage/langchain_upstage/layout_analysis_parsers.py b/libs/partners/upstage/langchain_upstage/layout_analysis_parsers.py
index 91244b79e703c..27d596c65261d 100644
--- a/libs/partners/upstage/langchain_upstage/layout_analysis_parsers.py
+++ b/libs/partners/upstage/langchain_upstage/layout_analysis_parsers.py
@@ -312,6 +312,8 @@ def lazy_parse(self, blob: Blob, is_batch: bool = False) -> Iterator[Document]:
                     start_page += num_pages
 
             else:
+                if not blob.path:
+                    raise ValueError("Blob path is required for non-PDF files.")
                 with open(blob.path, "rb") as f:
                     response = self._get_response({"document": f})
                     result = parse_output(response, self.output_type)
@@ -339,6 +341,8 @@ def lazy_parse(self, blob: Blob, is_batch: bool = False) -> Iterator[Document]:
                     start_page += num_pages
 
             else:
+                if not blob.path:
+                    raise ValueError("Blob path is required for non-PDF files.")
                 with open(blob.path, "rb") as f:
                     response = self._get_response({"document": f})
 
@@ -358,6 +362,8 @@ def lazy_parse(self, blob: Blob, is_batch: bool = False) -> Iterator[Document]:
 
                     start_page += num_pages
             else:
+                if not blob.path:
+                    raise ValueError("Blob path is required for non-PDF files.")
                 with open(blob.path, "rb") as f:
                     response = self._get_response({"document": f})