diff --git a/lightrag/kg/json_doc_status_impl.py b/lightrag/kg/json_doc_status_impl.py
index df6502ee..8b9302a8 100644
--- a/lightrag/kg/json_doc_status_impl.py
+++ b/lightrag/kg/json_doc_status_impl.py
@@ -113,8 +113,8 @@ class JsonDocStatusStorage(DocStatusStorage):
                         data = v.copy()
                         # Remove deprecated content field if it exists
                         data.pop("content", None)
-                        # If file_path is not in data, use document id as file path
-                        if "file_path" not in data:
+                        # If file_path is missing or null, use placeholder value
+                        if data.get("file_path") is None:
                             data["file_path"] = "no-file-path"
                         # Ensure new fields exist with default values
                         if "metadata" not in data:
@@ -142,8 +142,8 @@ class JsonDocStatusStorage(DocStatusStorage):
                         data = v.copy()
                         # Remove deprecated content field if it exists
                         data.pop("content", None)
-                        # If file_path is not in data, use document id as file path
-                        if "file_path" not in data:
+                        # If file_path is missing or null, use placeholder value
+                        if data.get("file_path") is None:
                             data["file_path"] = "no-file-path"
                         # Ensure new fields exist with default values
                         if "metadata" not in data:
@@ -274,7 +274,7 @@ class JsonDocStatusStorage(DocStatusStorage):
                     # Prepare document data
                     data = doc_data.copy()
                     data.pop("content", None)
-                    if "file_path" not in data:
+                    if data.get("file_path") is None:
                         data["file_path"] = "no-file-path"
                     if "metadata" not in data:
                         data["metadata"] = {}
diff --git a/lightrag/kg/mongo_impl.py b/lightrag/kg/mongo_impl.py
index e6ca5f5c..45a7b4eb 100644
--- a/lightrag/kg/mongo_impl.py
+++ b/lightrag/kg/mongo_impl.py
@@ -294,8 +294,8 @@ class MongoDocStatusStorage(DocStatusStorage):
         data.pop("content", None)
         # Remove MongoDB _id field if it exists
         data.pop("_id", None)
-        # If file_path is not in data, use document id as file path
-        if "file_path" not in data:
+        # If file_path is missing or null, use placeholder value
+        if data.get("file_path") is None:
             data["file_path"] = "no-file-path"
         # Ensure new fields exist with default values
         if "metadata" not in data:
diff --git a/lightrag/kg/postgres_impl.py b/lightrag/kg/postgres_impl.py
index 1fd76276..e2473c14 100644
--- a/lightrag/kg/postgres_impl.py
+++ b/lightrag/kg/postgres_impl.py
@@ -3643,6 +3643,10 @@ class PGDocStatusStorage(DocStatusStorage):
             created_at = self._format_datetime_with_timezone(element["created_at"])
             updated_at = self._format_datetime_with_timezone(element["updated_at"])
 
+            file_path = element.get("file_path")
+            if file_path is None:
+                file_path = "no-file-path"
+
             doc_status = DocProcessingStatus(
                 content_summary=element["content_summary"],
                 content_length=element["content_length"],
@@ -3650,7 +3654,7 @@ class PGDocStatusStorage(DocStatusStorage):
                 created_at=created_at,
                 updated_at=updated_at,
                 chunks_count=element["chunks_count"],
-                file_path=element["file_path"],
+                file_path=file_path,
                 chunks_list=chunks_list,
                 track_id=element.get("track_id"),
                 metadata=metadata,
diff --git a/lightrag/kg/redis_impl.py b/lightrag/kg/redis_impl.py
index d2030c3e..568a4197 100644
--- a/lightrag/kg/redis_impl.py
+++ b/lightrag/kg/redis_impl.py
@@ -754,8 +754,8 @@ class RedisDocStatusStorage(DocStatusStorage):
                                         data = doc_data.copy()
                                         # Remove deprecated content field if it exists
                                         data.pop("content", None)
-                                        # If file_path is not in data, use document id as file path
-                                        if "file_path" not in data:
+                                        # If file_path is missing or null, use placeholder value
+                                        if data.get("file_path") is None:
                                             data["file_path"] = "no-file-path"
                                         # Ensure new fields exist with default values
                                         if "metadata" not in data:
@@ -810,8 +810,8 @@ class RedisDocStatusStorage(DocStatusStorage):
                                         data = doc_data.copy()
                                         # Remove deprecated content field if it exists
                                         data.pop("content", None)
-                                        # If file_path is not in data, use document id as file path
-                                        if "file_path" not in data:
+                                        # If file_path is missing or null, use placeholder value
+                                        if data.get("file_path") is None:
                                             data["file_path"] = "no-file-path"
                                         # Ensure new fields exist with default values
                                         if "metadata" not in data:
@@ -977,7 +977,7 @@ class RedisDocStatusStorage(DocStatusStorage):
                                     # Prepare document data
                                     data = doc_data.copy()
                                     data.pop("content", None)
-                                    if "file_path" not in data:
+                                    if data.get("file_path") is None:
                                         data["file_path"] = "no-file-path"
                                     if "metadata" not in data:
                                         data["metadata"] = {}