diff --git a/packages/backend/src/queue/processors/InboxProcessorService.ts b/packages/backend/src/queue/processors/InboxProcessorService.ts
index 079e014da8..ebe9c3984c 100644
--- a/packages/backend/src/queue/processors/InboxProcessorService.ts
+++ b/packages/backend/src/queue/processors/InboxProcessorService.ts
@@ -235,6 +235,9 @@ export class InboxProcessorService implements OnApplicationShutdown {
 				if (e.id === 'd450b8a9-48e4-4dab-ae36-f4db763fda7c') { // invalid Note
 					return e.message;
 				}
+				if (e.id === '9f466dab-c856-48cd-9e65-ff90ff750580') {
+					return 'note contains too many mentions';
+				}
 			}
 			throw e;
 		}