From 5928b8b9ae3d79a492bf3275d9b851434c3a188e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E3=81=A1=E3=83=BC?=
 <85853517+Dimon0000000@users.noreply.github.com>
Date: Wed, 24 Jun 2026 13:07:40 +0800
Subject: [PATCH] fix(document_service): prevent NoneType error on
 progress_msg.strip() (#16289)

### What problem does this PR solve?

When I run RAGFlow_server.py:
```
2026-06-24 10:27:01,938 ERROR    3413485 fetch task exception
Traceback (most recent call last):
  File "/home/infiniflow/Documents/development/ragflow/api/db/services/document_service.py", line 948, in _sync_progress
    if t.progress_msg.strip():
       ^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'strip'

```

fixed:
```python
if t.progress_msg.strip():

# fix:
if (t.progress_msg or "").strip():
```

Fix crash in `_sync_progress` when `progress_msg` is `None`.

#### Root Cause
`progress_msg` from task records can be `None`, causing:

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
---
 api/db/services/document_service.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/api/db/services/document_service.py b/api/db/services/document_service.py
index 12fdc19fef..d5bff3e200 100644
--- a/api/db/services/document_service.py
+++ b/api/db/services/document_service.py
@@ -945,7 +945,7 @@ class DocumentService(CommonService):
                     if t.progress == -1:
                         bad += 1
                     prg += t.progress if t.progress >= 0 else 0
-                    if t.progress_msg.strip():
+                    if (t.progress_msg or "").strip():
                         msg.append(t.progress_msg)
                     priority = max(priority, t.priority)
                 prg /= len(tsks)