diff --git a/haiku_rag_slim/haiku/rag/ingester/sources/fs.py b/haiku_rag_slim/haiku/rag/ingester/sources/fs.py
index 8b944e04..8de87469 100644
--- a/haiku_rag_slim/haiku/rag/ingester/sources/fs.py
+++ b/haiku_rag_slim/haiku/rag/ingester/sources/fs.py
@@ -139,7 +139,12 @@ class FSSource:
             if not self.filter.include_file(str(path)):
                 continue
             uri = path.as_uri()
-            revision = str(path.stat().st_mtime_ns)
+            try:
+                revision = str(path.stat().st_mtime_ns)
+            except FileNotFoundError:
+                # File was deleted between the os.walk() and stat() call.
+                # Skip it — the next sweep (or watchfiles) will emit DELETE.
+                continue
             seen.add(uri)
             previous = snapshot.get(uri)
             kind = (
diff --git a/tests/ingester/test_fs_source.py b/tests/ingester/test_fs_source.py
index df32304f..c827bf0e 100644
--- a/tests/ingester/test_fs_source.py
+++ b/tests/ingester/test_fs_source.py
@@ -131,6 +131,25 @@ async def test_fs_source_discover_respects_extension_filter(fs_root: Path):
     assert (fs_root / "b.txt").as_uri() not in uris
 
 
+@pytest.mark.asyncio
+async def test_fs_source_discover_skips_file_deleted_during_stat(fs_root: Path):
+    """A file deleted between os.walk() and stat() should be silently
+    skipped instead of crashing the entire discover() sweep."""
+    src = FSSource(root=fs_root, supported_extensions=[".md", ".txt"])
+    events = []
+    async for event in src.discover(since=None):
+        events.append(event)
+        # Delete a file mid-iteration so the next stat() hits a missing file.
+        victim = fs_root / "b.txt"
+        if victim.exists():
+            victim.unlink()
+    uris = {e.uri for e in events}
+    # a.md and sub/c.md should still appear; b.txt may or may not depending
+    # on iteration order, but the key assertion is no exception was raised.
+    assert (fs_root / "a.md").as_uri() in uris
+    assert (fs_root / "sub" / "c.md").as_uri() in uris
+
+
 @pytest.mark.asyncio
 async def test_fs_source_discover_respects_ignore_patterns(fs_root: Path):
     src = FSSource(