diff --git a/glob/manager_server.py b/glob/manager_server.py
index 8474bb9c..ae83270b 100644
--- a/glob/manager_server.py
+++ b/glob/manager_server.py
@@ -333,7 +333,7 @@ def _reject_simple_form_content_type(request):
     Applied ONLY to POST handlers that do not consume a request body (e.g.,
     /snapshot/save, /manager/queue/{reset,start,update_comfyui},
     /manager/reboot). These are vulnerable to cross-origin <form method=POST>
-    attacks because the handler accepts the request without parsing any body —
+    attacks because the handler accepts the request without parsing any body,
     the attacker needs no ability to forge a valid payload, only to point a
     hidden form at the URL.
 
@@ -342,8 +342,8 @@ def _reject_simple_form_content_type(request):
     body because the browser refuses to send ``application/json`` without a
     CORS preflight, which this server does not answer.
 
-    DO NOT add this gate to body-reading handlers — redundant and UX-breaking.
-    DO NOT remove this gate from no-body handlers — this is the bypass vector.
+    DO NOT add this gate to body-reading handlers, redundant and UX-breaking.
+    DO NOT remove this gate from no-body handlers, this is the bypass vector.
 
     aiohttp's ``request.content_type`` normalizes the header (lower-cases,
     strips parameters), so ``multipart/form-data; boundary=----X`` is compared
@@ -353,8 +353,12 @@ def _reject_simple_form_content_type(request):
         web.Response(status=400) when the request has a simple-form
         Content-Type that must be rejected. None when the request is allowed
         to proceed (no Content-Type, application/json, or any non-simple
-        Content-Type).
+        Content-Type, or no request object, internal caller).
     """
+    # Internal callers (e.g. legacy-UI batch flows) invoke route handlers
+    # directly with request=None; there is no Content-Type to gate.
+    if request is None:
+        return None
     if request.content_type in _SIMPLE_FORM_CONTENT_TYPES:
         return web.Response(
             status=400,
diff --git a/tests/test_csrf_content_type_helper.py b/tests/test_csrf_content_type_helper.py
index e1467475..0a167a67 100644
--- a/tests/test_csrf_content_type_helper.py
+++ b/tests/test_csrf_content_type_helper.py
@@ -23,7 +23,7 @@ from aiohttp.test_utils import TestClient, TestServer
 
 # Parse the helper from manager_server.py without importing it, to avoid
 # pulling in the full ComfyUI/PromptServer stack. Note: we intentionally do
-# NOT add the `glob/` directory to sys.path — the dir name would shadow
+# NOT add the `glob/` directory to sys.path, the dir name would shadow
 # Python's stdlib `glob` module and break pytest collection.
 REPO_ROOT = Path(__file__).resolve().parent.parent
 
@@ -116,6 +116,12 @@ class ContentTypeRejectionTest(unittest.TestCase):
         r = self._post({"Content-Type": "application/json"})
         self.assertEqual(r.status, 200)
 
+    def test_none_request_allowed(self):
+        # Internal callers (e.g. legacy-UI batch flows) invoke route handlers
+        # directly with request=None; helper must not raise AttributeError.
+        # Regression test for issue #2843.
+        self.assertIsNone(_reject_simple_form_content_type(None))
+
 
 if __name__ == "__main__":
     unittest.main(verbosity=2)