1 files changed, 4 insertions, 3 deletions
diff --git a/synapse/federation/transport/server/federation.py b/synapse/federation/transport/server/federation.py
index 20f87c885e..eb96ff27f9 100644
--- a/synapse/federation/transport/server/federation.py
+++ b/synapse/federation/transport/server/federation.py
@@ -24,6 +24,7 @@ from typing import (
     TYPE_CHECKING,
     Dict,
     List,
+    Literal,
     Mapping,
     Optional,
     Sequence,
@@ -32,8 +33,6 @@ from typing import (
     Union,
 )
 
-from typing_extensions import Literal
-
 from synapse.api.constants import Direction, EduTypes
 from synapse.api.errors import Codes, SynapseError
 from synapse.api.room_versions import RoomVersions
@@ -509,6 +508,9 @@ class FederationV2InviteServlet(BaseFederationServerServlet):
         event = content["event"]
         invite_room_state = content.get("invite_room_state", [])
 
+        if not isinstance(invite_room_state, list):
+            invite_room_state = []
+
         # Synapse expects invite_room_state to be in unsigned, as it is in v1
         # API
 
@@ -859,7 +861,6 @@ class FederationMediaThumbnailServlet(BaseFederationServerServlet):
         request: SynapseRequest,
         media_id: str,
     ) -> None:
-
         width = parse_integer(request, "width", required=True)
         height = parse_integer(request, "height", required=True)
         method = parse_string(request, "method", "scale")